Python

Python PerlC Java

Python Python

Python

Linux Python ,

$ python
Python 2.7.6 (default, Sep 9 2014, 15:04:36)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

Windows Python

[prompt_1.png]

Python Enter

>>> print ("Hello, Python!")

Python 2.7.6 ,

Hello, Python!

Python Python .py test.py

print ("Hello, Python!")

Python PATH

$ python test.py

Hello, Python!

Python test.py

#!/usr/bin/python

print ("Hello, Python!")

Python/usr/bin

$ chmod +x test.py     # 
$ ./test.py

Hello, Python!

Python2.x Python3.x print

Python2.x Python3.x print __future__ Python2.x print Python3.x print

>>> list =["a", "b", "c"]
>>> print list # python2.x print
['a', 'b', 'c']
>>> from __future__ import print_function # __future__
>>> print list # Python2.x print
File "<stdin>", line 1
print list
^
SyntaxError: invalid syntax
>>> print (list) # Python3.x print
['a', 'b', 'c']
>>>

Python3.x Python2.x __future__

Python

Python (_)

Python

_foo from xxx import *

__foo __foo__ Python __init__()

Python ;

>>> print ('hello');print ('runoob');
hello
runoob

Python

and	exec	not
assert	finally	or
break	for	pass
class	from	print
continue	global	raise
def	if	return
del	import	try
elif	in	while
else	is	with
except	lambda	yield

Python Python {} python

if True:
print ("True")
else:
print ("False")

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# test.py

if True:
print ("Answer")
print ("True")
else:
print ("Answer")
#
print ("False")

  File "test.py", line 11
    print ("False")
                  ^
IndentationError: unindent does not match any outer indentation level

IndentationError: unindent does not match any outer indentation level tab

IndentationError: unexpected indent , python "Hi tab " python

Python

total = item_one + \
        item_two + \
        item_three

[], {} ()

days = ['Monday', 'Tuesday', 'Wednesday',
        'Thursday', 'Friday']

Python

Python ( ' )( " )( ''' """ )

word = 'word'
sentence = ""
paragraph = """
"""

Python

python #

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# test.py

#
print ("Hello, Python!") #

Hello, Python!

name = "Runoob" #

python ''' """

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# test.py

'''

'''

"""

"""

Python

PythonPython

#!/usr/bin/python
# -*- coding: UTF-8 -*-

raw_input(" enter ...\n")

\n enter()

Python(;)

#!/usr/bin/python

import sys; x = 'runoob'; sys.stdout.write(x + '\n')

$ python test.py
runoob

print

print ,

#!/usr/bin/python
# -*- coding: UTF-8 -*-

x="a"
y="b"
#
print x
print y

print '---------'
#
print x,
print y,

#
print x,y

a
b
---------
a b a b

Python2 Python3 print

ifwhiledefclass( : )

(clause)

if expression : 
   suite 
elif expression :  
   suite  
else :  
   suite

Python -h

$ python -h 
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ... 
Options and arguments (and corresponding environment variables): 
-c cmd : program passed in as string (terminates option list) 
-d     : debug output from parser (also PYTHONDEBUG=x) 
-E     : ignore environment variables (such as PYTHONPATH) 
-h     : print this help message and exit 
 
[ etc. ]

Python Python