Python基礎講座 #5 IPython

>>> print('Hello World!')
Hello World!

>>> myvar = 'This is myvar variable'
>>> print(myvar)
This is myvar variable

>>> import os
>>> os.getcwd()
'C:\\\\Users\\\\Curtis'

>>> for i in range(10):
...   print(i)
...
0
1
2
3
4
5
6
7
8
9

In [1]: print('Hello World!')
Hello World!

In [2]: myvar = 'This is myvar variable'
In [3]: print(myvar)
This is myvar variable

In [4]: import os
In [5]: os.getcwd()
Out[5]: 'D:\\\\OneDrive\\\\Projects\\\\Python Tutorials\\\\tutorial 5'

In [6]: os?
Type:        module
String form: <module 'os' from 'C:\\\\Users\\\\CURTIS\\\\anaconda3\\\\lib\\\\os.py'>
File:        c:\\users\\curtis\\anaconda3\\lib\\os.py
Docstring:
OS routines for NT or Posix depending on what system we're on.

This exports:
- all functions from posix or nt, e.g. unlink, stat, etc.
- os.path is either posixpath or ntpath
- os.name is either 'posix' or 'nt'
- os.curdir is a string representing the current directory (always '.')
- os.pardir is a string representing the parent directory (always '..')
- os.sep is the (or a most common) pathname separator ('/' or '\\\\')
- os.extsep is the extension separator (always '.')
- os.altsep is the alternate pathname separator (None or '/')
- os.pathsep is the component separator used in $PATH etc
- os.linesep is the line separator in text files ('\\r' or '\\n' or '\\r\\n')
- os.defpath is the default search path for executables
- os.devnull is the file path of the null device ('/dev/null', etc.)

Programs that import and use 'os' stand a better chance of being
portable between different platforms.  Of course, they must then
only use functions that are defined by all platforms (e.g., unlink
and opendir), and leave all pathname manipulation to os.path
(e.g., split and join).

In [7]: os.getcwd?
Signature: os.getcwd()
Docstring: Return a unicode string representing the current working directory.
Type:      builtin_function_or_method

In [18]: %quickref

IPython -- An enhanced Interactive Python - Quick Reference Card
================================================================

obj?, obj??      : Get help, or more help for object (also works as
?obj, ??obj).
?foo.*abc*       : List names in 'foo' containing 'abc' in them.
%magic           : Information about IPython's 'magic' % functions.

Magic functions are prefixed by % or %%, and typically take their arguments
without parentheses, quotes or even commas for convenience.  Line magics take a
single % and cell magics are prefixed with two %%.

Example magic function calls:

%alias d ls -F   : 'd' is now an alias for 'ls -F'
alias d ls -F    : Works if 'alias' not a python name
alist = %alias   : Get list of aliases to 'alist'
cd /usr/share    : Obvious. cd -<tab> to choose from visited dirs.
%cd??            : See help AND source for magic %cd
%timeit x=10     : time the 'x=10' statement with high precision.
%%timeit x=2**100
x**100           : time 'x**100' with a setup of 'x=2**100'; setup code is not
counted.  This is an example of a cell magic.

System commands:

!cp a.txt b/     : System command escape, calls os.system()
cp a.txt b/      : after %rehashx, most system commands work without !
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