Show More
@@ -1,525 +1,587 b'' | |||
|
1 | 1 | """Implementation of basic magic functions. |
|
2 | 2 | """ |
|
3 | 3 | #----------------------------------------------------------------------------- |
|
4 | 4 | # Copyright (c) 2012 The IPython Development Team. |
|
5 | 5 | # |
|
6 | 6 | # Distributed under the terms of the Modified BSD License. |
|
7 | 7 | # |
|
8 | 8 | # The full license is in the file COPYING.txt, distributed with this software. |
|
9 | 9 | #----------------------------------------------------------------------------- |
|
10 | 10 | |
|
11 | 11 | #----------------------------------------------------------------------------- |
|
12 | 12 | # Imports |
|
13 | 13 | #----------------------------------------------------------------------------- |
|
14 | 14 | from __future__ import print_function |
|
15 | 15 | |
|
16 | 16 | # Stdlib |
|
17 | 17 | import io |
|
18 | 18 | import sys |
|
19 | 19 | from pprint import pformat |
|
20 | 20 | |
|
21 | 21 | # Our own packages |
|
22 | from IPython.core import magic_arguments | |
|
22 | 23 | from IPython.core.error import UsageError |
|
23 | 24 | from IPython.core.magic import Magics, magics_class, line_magic, magic_escapes |
|
24 | 25 | from IPython.utils.text import format_screen |
|
25 | 26 | from IPython.core import magic_arguments, page |
|
26 | 27 | from IPython.testing.skipdoctest import skip_doctest |
|
27 | 28 | from IPython.utils.ipstruct import Struct |
|
28 | 29 | from IPython.utils.path import unquote_filename |
|
29 | 30 | from IPython.utils.warn import warn, error |
|
30 | 31 | |
|
31 | 32 | #----------------------------------------------------------------------------- |
|
32 | 33 | # Magics class implementation |
|
33 | 34 | #----------------------------------------------------------------------------- |
|
34 | 35 | |
|
35 | 36 | @magics_class |
|
36 | 37 | class BasicMagics(Magics): |
|
37 | 38 | """Magics that provide central IPython functionality. |
|
38 | 39 | |
|
39 | 40 | These are various magics that don't fit into specific categories but that |
|
40 | 41 | are all part of the base 'IPython experience'.""" |
|
41 | 42 | |
|
43 | @magic_arguments.magic_arguments() | |
|
44 | @magic_arguments.argument( | |
|
45 | '-l', '--line', action='store_true', | |
|
46 | help="""Create a line magic alias.""" | |
|
47 | ) | |
|
48 | @magic_arguments.argument( | |
|
49 | '-c', '--cell', action='store_true', | |
|
50 | help="""Create a cell magic alias.""" | |
|
51 | ) | |
|
52 | @magic_arguments.argument( | |
|
53 | 'name', | |
|
54 | help="""Name of the magic to be created.""" | |
|
55 | ) | |
|
56 | @magic_arguments.argument( | |
|
57 | 'target', | |
|
58 | help="""Name of the existing line or cell magic.""" | |
|
59 | ) | |
|
60 | @line_magic | |
|
61 | def alias_magic(self, line=''): | |
|
62 | """Create an alias for an existing line or cell magic.""" | |
|
63 | args = magic_arguments.parse_argstring(self.alias_magic, line) | |
|
64 | shell = self.shell | |
|
65 | escs = ''.join(magic_escapes.values()) | |
|
66 | ||
|
67 | target = args.target.lstrip(escs) | |
|
68 | name = args.name.lstrip(escs) | |
|
69 | ||
|
70 | # Find the requested magics. | |
|
71 | m_line = shell.find_magic(target, 'line') | |
|
72 | m_cell = shell.find_magic(target, 'cell') | |
|
73 | if args.line and m_line is None: | |
|
74 | raise UsageError('Line magic function `%s%s` not found.' % | |
|
75 | (magic_escapes['line'], target)) | |
|
76 | if args.cell and m_cell is None: | |
|
77 | raise UsageError('Cell magic function `%s%s` not found.' % | |
|
78 | (magic_escapes['cell'], target)) | |
|
79 | ||
|
80 | # If --line and --cell are not specified, default to the ones | |
|
81 | # that are available. | |
|
82 | if not args.line and not args.cell: | |
|
83 | if not m_line and not m_cell: | |
|
84 | raise UsageError( | |
|
85 | 'No line or cell magic with name `%s` found.' % target | |
|
86 | ) | |
|
87 | args.line = bool(m_line) | |
|
88 | args.cell = bool(m_cell) | |
|
89 | ||
|
90 | if args.line: | |
|
91 | def wrapper(line): return m_line(line) | |
|
92 | wrapper.__name__ = str(name) | |
|
93 | wrapper.__doc__ = "Alias for `%s%s`." % \ | |
|
94 | (magic_escapes['line'], target) | |
|
95 | shell.register_magic_function(wrapper, 'line', name) | |
|
96 | ||
|
97 | if args.cell: | |
|
98 | def wrapper(line, cell): return m_cell(line, cell) | |
|
99 | wrapper.__name__ = str(name) | |
|
100 | wrapper.__doc__ = "Alias for `%s%s`." % \ | |
|
101 | (magic_escapes['cell'], target) | |
|
102 | shell.register_magic_function(wrapper, 'cell', name) | |
|
103 | ||
|
42 | 104 | def _lsmagic(self): |
|
43 | 105 | mesc = magic_escapes['line'] |
|
44 | 106 | cesc = magic_escapes['cell'] |
|
45 | 107 | mman = self.shell.magics_manager |
|
46 | 108 | magics = mman.lsmagic() |
|
47 | 109 | out = ['Available line magics:', |
|
48 | 110 | mesc + (' '+mesc).join(sorted(magics['line'])), |
|
49 | 111 | '', |
|
50 | 112 | 'Available cell magics:', |
|
51 | 113 | cesc + (' '+cesc).join(sorted(magics['cell'])), |
|
52 | 114 | '', |
|
53 | 115 | mman.auto_status()] |
|
54 | 116 | return '\n'.join(out) |
|
55 | 117 | |
|
56 | 118 | @line_magic |
|
57 | 119 | def lsmagic(self, parameter_s=''): |
|
58 | 120 | """List currently available magic functions.""" |
|
59 | 121 | print(self._lsmagic()) |
|
60 | 122 | |
|
61 | 123 | def _magic_docs(self, brief=False, rest=False): |
|
62 | 124 | """Return docstrings from magic functions.""" |
|
63 | 125 | mman = self.shell.magics_manager |
|
64 | 126 | docs = mman.lsmagic_docs(brief, missing='No documentation') |
|
65 | 127 | |
|
66 | 128 | if rest: |
|
67 | 129 | format_string = '**%s%s**::\n\n\t%s\n\n' |
|
68 | 130 | else: |
|
69 | 131 | format_string = '%s%s:\n\t%s\n' |
|
70 | 132 | |
|
71 | 133 | return ''.join( |
|
72 | 134 | [format_string % (magic_escapes['line'], fname, fndoc) |
|
73 | 135 | for fname, fndoc in sorted(docs['line'].items())] |
|
74 | 136 | + |
|
75 | 137 | [format_string % (magic_escapes['cell'], fname, fndoc) |
|
76 | 138 | for fname, fndoc in sorted(docs['cell'].items())] |
|
77 | 139 | ) |
|
78 | 140 | |
|
79 | 141 | @line_magic |
|
80 | 142 | def magic(self, parameter_s=''): |
|
81 | 143 | """Print information about the magic function system. |
|
82 | 144 | |
|
83 | 145 | Supported formats: -latex, -brief, -rest |
|
84 | 146 | """ |
|
85 | 147 | |
|
86 | 148 | mode = '' |
|
87 | 149 | try: |
|
88 | 150 | mode = parameter_s.split()[0][1:] |
|
89 | 151 | if mode == 'rest': |
|
90 | 152 | rest_docs = [] |
|
91 | 153 | except IndexError: |
|
92 | 154 | pass |
|
93 | 155 | |
|
94 | 156 | brief = (mode == 'brief') |
|
95 | 157 | rest = (mode == 'rest') |
|
96 | 158 | magic_docs = self._magic_docs(brief, rest) |
|
97 | 159 | |
|
98 | 160 | if mode == 'latex': |
|
99 | 161 | print(self.format_latex(magic_docs)) |
|
100 | 162 | return |
|
101 | 163 | else: |
|
102 | 164 | magic_docs = format_screen(magic_docs) |
|
103 | 165 | |
|
104 | 166 | out = [""" |
|
105 | 167 | IPython's 'magic' functions |
|
106 | 168 | =========================== |
|
107 | 169 | |
|
108 | 170 | The magic function system provides a series of functions which allow you to |
|
109 | 171 | control the behavior of IPython itself, plus a lot of system-type |
|
110 | 172 | features. There are two kinds of magics, line-oriented and cell-oriented. |
|
111 | 173 | |
|
112 | 174 | Line magics are prefixed with the % character and work much like OS |
|
113 | 175 | command-line calls: they get as an argument the rest of the line, where |
|
114 | 176 | arguments are passed without parentheses or quotes. For example, this will |
|
115 | 177 | time the given statement:: |
|
116 | 178 | |
|
117 | 179 | %timeit range(1000) |
|
118 | 180 | |
|
119 | 181 | Cell magics are prefixed with a double %%, and they are functions that get as |
|
120 | 182 | an argument not only the rest of the line, but also the lines below it in a |
|
121 | 183 | separate argument. These magics are called with two arguments: the rest of the |
|
122 | 184 | call line and the body of the cell, consisting of the lines below the first. |
|
123 | 185 | For example:: |
|
124 | 186 | |
|
125 | 187 | %%timeit x = numpy.random.randn((100, 100)) |
|
126 | 188 | numpy.linalg.svd(x) |
|
127 | 189 | |
|
128 | 190 | will time the execution of the numpy svd routine, running the assignment of x |
|
129 | 191 | as part of the setup phase, which is not timed. |
|
130 | 192 | |
|
131 | 193 | In a line-oriented client (the terminal or Qt console IPython), starting a new |
|
132 | 194 | input with %% will automatically enter cell mode, and IPython will continue |
|
133 | 195 | reading input until a blank line is given. In the notebook, simply type the |
|
134 | 196 | whole cell as one entity, but keep in mind that the %% escape can only be at |
|
135 | 197 | the very start of the cell. |
|
136 | 198 | |
|
137 | 199 | NOTE: If you have 'automagic' enabled (via the command line option or with the |
|
138 | 200 | %automagic function), you don't need to type in the % explicitly for line |
|
139 | 201 | magics; cell magics always require an explicit '%%' escape. By default, |
|
140 | 202 | IPython ships with automagic on, so you should only rarely need the % escape. |
|
141 | 203 | |
|
142 | 204 | Example: typing '%cd mydir' (without the quotes) changes you working directory |
|
143 | 205 | to 'mydir', if it exists. |
|
144 | 206 | |
|
145 | 207 | For a list of the available magic functions, use %lsmagic. For a description |
|
146 | 208 | of any of them, type %magic_name?, e.g. '%cd?'. |
|
147 | 209 | |
|
148 | 210 | Currently the magic system has the following functions:""", |
|
149 | 211 | magic_docs, |
|
150 | 212 | "Summary of magic functions (from %slsmagic):", |
|
151 | 213 | self._lsmagic(), |
|
152 | 214 | ] |
|
153 | 215 | page.page('\n'.join(out)) |
|
154 | 216 | |
|
155 | 217 | |
|
156 | 218 | @line_magic |
|
157 | 219 | def page(self, parameter_s=''): |
|
158 | 220 | """Pretty print the object and display it through a pager. |
|
159 | 221 | |
|
160 | 222 | %page [options] OBJECT |
|
161 | 223 | |
|
162 | 224 | If no object is given, use _ (last output). |
|
163 | 225 | |
|
164 | 226 | Options: |
|
165 | 227 | |
|
166 | 228 | -r: page str(object), don't pretty-print it.""" |
|
167 | 229 | |
|
168 | 230 | # After a function contributed by Olivier Aubert, slightly modified. |
|
169 | 231 | |
|
170 | 232 | # Process options/args |
|
171 | 233 | opts, args = self.parse_options(parameter_s, 'r') |
|
172 | 234 | raw = 'r' in opts |
|
173 | 235 | |
|
174 | 236 | oname = args and args or '_' |
|
175 | 237 | info = self.shell._ofind(oname) |
|
176 | 238 | if info['found']: |
|
177 | 239 | txt = (raw and str or pformat)( info['obj'] ) |
|
178 | 240 | page.page(txt) |
|
179 | 241 | else: |
|
180 | 242 | print('Object `%s` not found' % oname) |
|
181 | 243 | |
|
182 | 244 | @line_magic |
|
183 | 245 | def profile(self, parameter_s=''): |
|
184 | 246 | """Print your currently active IPython profile.""" |
|
185 | 247 | from IPython.core.application import BaseIPythonApplication |
|
186 | 248 | if BaseIPythonApplication.initialized(): |
|
187 | 249 | print(BaseIPythonApplication.instance().profile) |
|
188 | 250 | else: |
|
189 | 251 | error("profile is an application-level value, but you don't appear to be in an IPython application") |
|
190 | 252 | |
|
191 | 253 | @line_magic |
|
192 | 254 | def pprint(self, parameter_s=''): |
|
193 | 255 | """Toggle pretty printing on/off.""" |
|
194 | 256 | ptformatter = self.shell.display_formatter.formatters['text/plain'] |
|
195 | 257 | ptformatter.pprint = bool(1 - ptformatter.pprint) |
|
196 | 258 | print('Pretty printing has been turned', |
|
197 | 259 | ['OFF','ON'][ptformatter.pprint]) |
|
198 | 260 | |
|
199 | 261 | @line_magic |
|
200 | 262 | def colors(self, parameter_s=''): |
|
201 | 263 | """Switch color scheme for prompts, info system and exception handlers. |
|
202 | 264 | |
|
203 | 265 | Currently implemented schemes: NoColor, Linux, LightBG. |
|
204 | 266 | |
|
205 | 267 | Color scheme names are not case-sensitive. |
|
206 | 268 | |
|
207 | 269 | Examples |
|
208 | 270 | -------- |
|
209 | 271 | To get a plain black and white terminal:: |
|
210 | 272 | |
|
211 | 273 | %colors nocolor |
|
212 | 274 | """ |
|
213 | 275 | def color_switch_err(name): |
|
214 | 276 | warn('Error changing %s color schemes.\n%s' % |
|
215 | 277 | (name, sys.exc_info()[1])) |
|
216 | 278 | |
|
217 | 279 | |
|
218 | 280 | new_scheme = parameter_s.strip() |
|
219 | 281 | if not new_scheme: |
|
220 | 282 | raise UsageError( |
|
221 | 283 | "%colors: you must specify a color scheme. See '%colors?'") |
|
222 | 284 | return |
|
223 | 285 | # local shortcut |
|
224 | 286 | shell = self.shell |
|
225 | 287 | |
|
226 | 288 | import IPython.utils.rlineimpl as readline |
|
227 | 289 | |
|
228 | 290 | if not shell.colors_force and \ |
|
229 | 291 | not readline.have_readline and sys.platform == "win32": |
|
230 | 292 | msg = """\ |
|
231 | 293 | Proper color support under MS Windows requires the pyreadline library. |
|
232 | 294 | You can find it at: |
|
233 | 295 | http://ipython.org/pyreadline.html |
|
234 | 296 | Gary's readline needs the ctypes module, from: |
|
235 | 297 | http://starship.python.net/crew/theller/ctypes |
|
236 | 298 | (Note that ctypes is already part of Python versions 2.5 and newer). |
|
237 | 299 | |
|
238 | 300 | Defaulting color scheme to 'NoColor'""" |
|
239 | 301 | new_scheme = 'NoColor' |
|
240 | 302 | warn(msg) |
|
241 | 303 | |
|
242 | 304 | # readline option is 0 |
|
243 | 305 | if not shell.colors_force and not shell.has_readline: |
|
244 | 306 | new_scheme = 'NoColor' |
|
245 | 307 | |
|
246 | 308 | # Set prompt colors |
|
247 | 309 | try: |
|
248 | 310 | shell.prompt_manager.color_scheme = new_scheme |
|
249 | 311 | except: |
|
250 | 312 | color_switch_err('prompt') |
|
251 | 313 | else: |
|
252 | 314 | shell.colors = \ |
|
253 | 315 | shell.prompt_manager.color_scheme_table.active_scheme_name |
|
254 | 316 | # Set exception colors |
|
255 | 317 | try: |
|
256 | 318 | shell.InteractiveTB.set_colors(scheme = new_scheme) |
|
257 | 319 | shell.SyntaxTB.set_colors(scheme = new_scheme) |
|
258 | 320 | except: |
|
259 | 321 | color_switch_err('exception') |
|
260 | 322 | |
|
261 | 323 | # Set info (for 'object?') colors |
|
262 | 324 | if shell.color_info: |
|
263 | 325 | try: |
|
264 | 326 | shell.inspector.set_active_scheme(new_scheme) |
|
265 | 327 | except: |
|
266 | 328 | color_switch_err('object inspector') |
|
267 | 329 | else: |
|
268 | 330 | shell.inspector.set_active_scheme('NoColor') |
|
269 | 331 | |
|
270 | 332 | @line_magic |
|
271 | 333 | def xmode(self, parameter_s=''): |
|
272 | 334 | """Switch modes for the exception handlers. |
|
273 | 335 | |
|
274 | 336 | Valid modes: Plain, Context and Verbose. |
|
275 | 337 | |
|
276 | 338 | If called without arguments, acts as a toggle.""" |
|
277 | 339 | |
|
278 | 340 | def xmode_switch_err(name): |
|
279 | 341 | warn('Error changing %s exception modes.\n%s' % |
|
280 | 342 | (name,sys.exc_info()[1])) |
|
281 | 343 | |
|
282 | 344 | shell = self.shell |
|
283 | 345 | new_mode = parameter_s.strip().capitalize() |
|
284 | 346 | try: |
|
285 | 347 | shell.InteractiveTB.set_mode(mode=new_mode) |
|
286 | 348 | print('Exception reporting mode:',shell.InteractiveTB.mode) |
|
287 | 349 | except: |
|
288 | 350 | xmode_switch_err('user') |
|
289 | 351 | |
|
290 | 352 | @line_magic |
|
291 | 353 | def quickref(self,arg): |
|
292 | 354 | """ Show a quick reference sheet """ |
|
293 | 355 | from IPython.core.usage import quick_reference |
|
294 | 356 | qr = quick_reference + self._magic_docs(brief=True) |
|
295 | 357 | page.page(qr) |
|
296 | 358 | |
|
297 | 359 | @line_magic |
|
298 | 360 | def doctest_mode(self, parameter_s=''): |
|
299 | 361 | """Toggle doctest mode on and off. |
|
300 | 362 | |
|
301 | 363 | This mode is intended to make IPython behave as much as possible like a |
|
302 | 364 | plain Python shell, from the perspective of how its prompts, exceptions |
|
303 | 365 | and output look. This makes it easy to copy and paste parts of a |
|
304 | 366 | session into doctests. It does so by: |
|
305 | 367 | |
|
306 | 368 | - Changing the prompts to the classic ``>>>`` ones. |
|
307 | 369 | - Changing the exception reporting mode to 'Plain'. |
|
308 | 370 | - Disabling pretty-printing of output. |
|
309 | 371 | |
|
310 | 372 | Note that IPython also supports the pasting of code snippets that have |
|
311 | 373 | leading '>>>' and '...' prompts in them. This means that you can paste |
|
312 | 374 | doctests from files or docstrings (even if they have leading |
|
313 | 375 | whitespace), and the code will execute correctly. You can then use |
|
314 | 376 | '%history -t' to see the translated history; this will give you the |
|
315 | 377 | input after removal of all the leading prompts and whitespace, which |
|
316 | 378 | can be pasted back into an editor. |
|
317 | 379 | |
|
318 | 380 | With these features, you can switch into this mode easily whenever you |
|
319 | 381 | need to do testing and changes to doctests, without having to leave |
|
320 | 382 | your existing IPython session. |
|
321 | 383 | """ |
|
322 | 384 | |
|
323 | 385 | # Shorthands |
|
324 | 386 | shell = self.shell |
|
325 | 387 | pm = shell.prompt_manager |
|
326 | 388 | meta = shell.meta |
|
327 | 389 | disp_formatter = self.shell.display_formatter |
|
328 | 390 | ptformatter = disp_formatter.formatters['text/plain'] |
|
329 | 391 | # dstore is a data store kept in the instance metadata bag to track any |
|
330 | 392 | # changes we make, so we can undo them later. |
|
331 | 393 | dstore = meta.setdefault('doctest_mode',Struct()) |
|
332 | 394 | save_dstore = dstore.setdefault |
|
333 | 395 | |
|
334 | 396 | # save a few values we'll need to recover later |
|
335 | 397 | mode = save_dstore('mode',False) |
|
336 | 398 | save_dstore('rc_pprint',ptformatter.pprint) |
|
337 | 399 | save_dstore('xmode',shell.InteractiveTB.mode) |
|
338 | 400 | save_dstore('rc_separate_out',shell.separate_out) |
|
339 | 401 | save_dstore('rc_separate_out2',shell.separate_out2) |
|
340 | 402 | save_dstore('rc_prompts_pad_left',pm.justify) |
|
341 | 403 | save_dstore('rc_separate_in',shell.separate_in) |
|
342 | 404 | save_dstore('rc_plain_text_only',disp_formatter.plain_text_only) |
|
343 | 405 | save_dstore('prompt_templates',(pm.in_template, pm.in2_template, pm.out_template)) |
|
344 | 406 | |
|
345 | 407 | if mode == False: |
|
346 | 408 | # turn on |
|
347 | 409 | pm.in_template = '>>> ' |
|
348 | 410 | pm.in2_template = '... ' |
|
349 | 411 | pm.out_template = '' |
|
350 | 412 | |
|
351 | 413 | # Prompt separators like plain python |
|
352 | 414 | shell.separate_in = '' |
|
353 | 415 | shell.separate_out = '' |
|
354 | 416 | shell.separate_out2 = '' |
|
355 | 417 | |
|
356 | 418 | pm.justify = False |
|
357 | 419 | |
|
358 | 420 | ptformatter.pprint = False |
|
359 | 421 | disp_formatter.plain_text_only = True |
|
360 | 422 | |
|
361 | 423 | shell.magic('xmode Plain') |
|
362 | 424 | else: |
|
363 | 425 | # turn off |
|
364 | 426 | pm.in_template, pm.in2_template, pm.out_template = dstore.prompt_templates |
|
365 | 427 | |
|
366 | 428 | shell.separate_in = dstore.rc_separate_in |
|
367 | 429 | |
|
368 | 430 | shell.separate_out = dstore.rc_separate_out |
|
369 | 431 | shell.separate_out2 = dstore.rc_separate_out2 |
|
370 | 432 | |
|
371 | 433 | pm.justify = dstore.rc_prompts_pad_left |
|
372 | 434 | |
|
373 | 435 | ptformatter.pprint = dstore.rc_pprint |
|
374 | 436 | disp_formatter.plain_text_only = dstore.rc_plain_text_only |
|
375 | 437 | |
|
376 | 438 | shell.magic('xmode ' + dstore.xmode) |
|
377 | 439 | |
|
378 | 440 | # Store new mode and inform |
|
379 | 441 | dstore.mode = bool(1-int(mode)) |
|
380 | 442 | mode_label = ['OFF','ON'][dstore.mode] |
|
381 | 443 | print('Doctest mode is:', mode_label) |
|
382 | 444 | |
|
383 | 445 | @line_magic |
|
384 | 446 | def gui(self, parameter_s=''): |
|
385 | 447 | """Enable or disable IPython GUI event loop integration. |
|
386 | 448 | |
|
387 | 449 | %gui [GUINAME] |
|
388 | 450 | |
|
389 | 451 | This magic replaces IPython's threaded shells that were activated |
|
390 | 452 | using the (pylab/wthread/etc.) command line flags. GUI toolkits |
|
391 | 453 | can now be enabled at runtime and keyboard |
|
392 | 454 | interrupts should work without any problems. The following toolkits |
|
393 | 455 | are supported: wxPython, PyQt4, PyGTK, Tk and Cocoa (OSX):: |
|
394 | 456 | |
|
395 | 457 | %gui wx # enable wxPython event loop integration |
|
396 | 458 | %gui qt4|qt # enable PyQt4 event loop integration |
|
397 | 459 | %gui gtk # enable PyGTK event loop integration |
|
398 | 460 | %gui gtk3 # enable Gtk3 event loop integration |
|
399 | 461 | %gui tk # enable Tk event loop integration |
|
400 | 462 | %gui osx # enable Cocoa event loop integration |
|
401 | 463 | # (requires %matplotlib 1.1) |
|
402 | 464 | %gui # disable all event loop integration |
|
403 | 465 | |
|
404 | 466 | WARNING: after any of these has been called you can simply create |
|
405 | 467 | an application object, but DO NOT start the event loop yourself, as |
|
406 | 468 | we have already handled that. |
|
407 | 469 | """ |
|
408 | 470 | opts, arg = self.parse_options(parameter_s, '') |
|
409 | 471 | if arg=='': arg = None |
|
410 | 472 | try: |
|
411 | 473 | return self.shell.enable_gui(arg) |
|
412 | 474 | except Exception as e: |
|
413 | 475 | # print simple error message, rather than traceback if we can't |
|
414 | 476 | # hook up the GUI |
|
415 | 477 | error(str(e)) |
|
416 | 478 | |
|
417 | 479 | @skip_doctest |
|
418 | 480 | @line_magic |
|
419 | 481 | def precision(self, s=''): |
|
420 | 482 | """Set floating point precision for pretty printing. |
|
421 | 483 | |
|
422 | 484 | Can set either integer precision or a format string. |
|
423 | 485 | |
|
424 | 486 | If numpy has been imported and precision is an int, |
|
425 | 487 | numpy display precision will also be set, via ``numpy.set_printoptions``. |
|
426 | 488 | |
|
427 | 489 | If no argument is given, defaults will be restored. |
|
428 | 490 | |
|
429 | 491 | Examples |
|
430 | 492 | -------- |
|
431 | 493 | :: |
|
432 | 494 | |
|
433 | 495 | In [1]: from math import pi |
|
434 | 496 | |
|
435 | 497 | In [2]: %precision 3 |
|
436 | 498 | Out[2]: u'%.3f' |
|
437 | 499 | |
|
438 | 500 | In [3]: pi |
|
439 | 501 | Out[3]: 3.142 |
|
440 | 502 | |
|
441 | 503 | In [4]: %precision %i |
|
442 | 504 | Out[4]: u'%i' |
|
443 | 505 | |
|
444 | 506 | In [5]: pi |
|
445 | 507 | Out[5]: 3 |
|
446 | 508 | |
|
447 | 509 | In [6]: %precision %e |
|
448 | 510 | Out[6]: u'%e' |
|
449 | 511 | |
|
450 | 512 | In [7]: pi**10 |
|
451 | 513 | Out[7]: 9.364805e+04 |
|
452 | 514 | |
|
453 | 515 | In [8]: %precision |
|
454 | 516 | Out[8]: u'%r' |
|
455 | 517 | |
|
456 | 518 | In [9]: pi**10 |
|
457 | 519 | Out[9]: 93648.047476082982 |
|
458 | 520 | """ |
|
459 | 521 | ptformatter = self.shell.display_formatter.formatters['text/plain'] |
|
460 | 522 | ptformatter.float_precision = s |
|
461 | 523 | return ptformatter.float_format |
|
462 | 524 | |
|
463 | 525 | @magic_arguments.magic_arguments() |
|
464 | 526 | @magic_arguments.argument( |
|
465 | 527 | '-e', '--export', action='store_true', default=False, |
|
466 | 528 | help='Export IPython history as a notebook. The filename argument ' |
|
467 | 529 | 'is used to specify the notebook name and format. For example ' |
|
468 | 530 | 'a filename of notebook.ipynb will result in a notebook name ' |
|
469 | 531 | 'of "notebook" and a format of "xml". Likewise using a ".json" ' |
|
470 | 532 | 'or ".py" file extension will write the notebook in the json ' |
|
471 | 533 | 'or py formats.' |
|
472 | 534 | ) |
|
473 | 535 | @magic_arguments.argument( |
|
474 | 536 | '-f', '--format', |
|
475 | 537 | help='Convert an existing IPython notebook to a new format. This option ' |
|
476 | 538 | 'specifies the new format and can have the values: xml, json, py. ' |
|
477 | 539 | 'The target filename is chosen automatically based on the new ' |
|
478 | 540 | 'format. The filename argument gives the name of the source file.' |
|
479 | 541 | ) |
|
480 | 542 | @magic_arguments.argument( |
|
481 | 543 | 'filename', type=unicode, |
|
482 | 544 | help='Notebook name or filename' |
|
483 | 545 | ) |
|
484 | 546 | @line_magic |
|
485 | 547 | def notebook(self, s): |
|
486 | 548 | """Export and convert IPython notebooks. |
|
487 | 549 | |
|
488 | 550 | This function can export the current IPython history to a notebook file |
|
489 | 551 | or can convert an existing notebook file into a different format. For |
|
490 | 552 | example, to export the history to "foo.ipynb" do "%notebook -e foo.ipynb". |
|
491 | 553 | To export the history to "foo.py" do "%notebook -e foo.py". To convert |
|
492 | 554 | "foo.ipynb" to "foo.json" do "%notebook -f json foo.ipynb". Possible |
|
493 | 555 | formats include (json/ipynb, py). |
|
494 | 556 | """ |
|
495 | 557 | args = magic_arguments.parse_argstring(self.notebook, s) |
|
496 | 558 | |
|
497 | 559 | from IPython.nbformat import current |
|
498 | 560 | args.filename = unquote_filename(args.filename) |
|
499 | 561 | if args.export: |
|
500 | 562 | fname, name, format = current.parse_filename(args.filename) |
|
501 | 563 | cells = [] |
|
502 | 564 | hist = list(self.shell.history_manager.get_range()) |
|
503 | 565 | for session, prompt_number, input in hist[:-1]: |
|
504 | 566 | cells.append(current.new_code_cell(prompt_number=prompt_number, |
|
505 | 567 | input=input)) |
|
506 | 568 | worksheet = current.new_worksheet(cells=cells) |
|
507 | 569 | nb = current.new_notebook(name=name,worksheets=[worksheet]) |
|
508 | 570 | with io.open(fname, 'w', encoding='utf-8') as f: |
|
509 | 571 | current.write(nb, f, format); |
|
510 | 572 | elif args.format is not None: |
|
511 | 573 | old_fname, old_name, old_format = current.parse_filename(args.filename) |
|
512 | 574 | new_format = args.format |
|
513 | 575 | if new_format == u'xml': |
|
514 | 576 | raise ValueError('Notebooks cannot be written as xml.') |
|
515 | 577 | elif new_format == u'ipynb' or new_format == u'json': |
|
516 | 578 | new_fname = old_name + u'.ipynb' |
|
517 | 579 | new_format = u'json' |
|
518 | 580 | elif new_format == u'py': |
|
519 | 581 | new_fname = old_name + u'.py' |
|
520 | 582 | else: |
|
521 | 583 | raise ValueError('Invalid notebook format: %s' % new_format) |
|
522 | 584 | with io.open(old_fname, 'r', encoding='utf-8') as f: |
|
523 | 585 | nb = current.read(f, old_format) |
|
524 | 586 | with io.open(new_fname, 'w', encoding='utf-8') as f: |
|
525 | 587 | current.write(nb, f, new_format) |
General Comments 0
You need to be logged in to leave comments.
Login now