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Diffstat (limited to 'Doc/library/idle.rst')
| -rw-r--r-- | Doc/library/idle.rst | 60 |
1 files changed, 48 insertions, 12 deletions
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst index c5015bf..fa58e2d 100644 --- a/Doc/library/idle.rst +++ b/Doc/library/idle.rst @@ -502,8 +502,16 @@ or immediately run an existing file before editing. Python Shell window ^^^^^^^^^^^^^^^^^^^ -The editing features described above work when entering code interactively. -IDLE's Shell window also responds to the following keys. +With IDLE's Shell, one enters, edits, and recalls complete statements. +Most consoles and terminals only work with a single physical line at a time. + +When one pastes code into Shell, it is not compiled and possibly executed +until one hits :kbd:`Return`. One may edit pasted code first. +If one pastes more that one statement into Shell, the result will be a +:exc:`SyntaxError` when multiple statements are compiled as if they were one. + +The editing features described in previous subsections work when entering +code interactively. IDLE's Shell window also responds to the following keys. * :kbd:`C-c` interrupts executing command @@ -520,16 +528,6 @@ IDLE's Shell window also responds to the following keys. * :kbd:`Return` while on any previous command retrieves that command -Shell has a special facility for squeezing output lines down to a -'Squeezed text' label. This is done automatically for output over N lines -(N = 50 by default). N can be changed in the PyShell section of the General -page of the Settings dialog. Output with fewer lines can be squeezed by -right clicking on the output. This can be useful for extra long lines. - -Squeezed output is expanded in place by double-clicking the label. -It can also be sent to the clipboard or a separate view window by -right-clicking the label. - Text colors ^^^^^^^^^^^ @@ -666,6 +664,44 @@ If ``sys`` is reset by user code, such as with ``importlib.reload(sys)``, IDLE's changes are lost and input from the keyboard and output to the screen will not work correctly. +User output in Shell +^^^^^^^^^^^^^^^^^^^^ + +When a program outputs text, the result is determined by the +corresponding output device. When IDLE executes user code, ``sys.stdout`` +and ``sys.stderr`` are connected to the display area of IDLE's Shell. Some of +its features are inherited from the underlying Tk Text widget. Others +are programmed additions. + +Text widgets display a subset of Unicode, the Basic Multilingual Plane (BMP). +Which characters get a proper glyph instead of a replacement box depends on +the operating system and installed fonts. Newline characters cause following +text to appear on a new line, but other control characters are replaced +with a box. But note that the ``repr()`` function, which is used for +interactive echo of expression values, replaces control characters +with escape codes before they are output. + +Normal and error output are generally kept separate (on separate lines) +from code input and each other. They each get different highlight colors. + +For SyntaxError tracebacks, the normal '^' marking where the error was +detected is replaced by coloring the text with an error highlight. +When code run from a file causes other exceptions, one may right click +on a traceback line to jump to the corresponding line in an IDLE editor. +The file will be opened if necessary. + +Shell has a special facility for squeezing output lines down to a +'Squeezed text' label. This is done automatically +for output over N lines (N = 50 by default). +N can be changed in the PyShell section of the General +page of the Settings dialog. Output with fewer lines can be squeezed by +right clicking on the output. This can be useful lines long enough to slow +down scrolling. + +Squeezed output is expanded in place by double-clicking the label. +It can also be sent to the clipboard or a separate view window by +right-clicking the label. + Developing tkinter applications ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |