Python练习程序1
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c:python>python
Python 2.3.5 (#62, Feb 8 2005, 16:23:02) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 01, 010, 0100
(1, 8, 64)
>>> 0x01, 0x10, 0xFF
(1, 16, 255)
>>> oct(64), hex(64), hex(255)
('0100', '0x40', '0xff')
>>> int('0100'), int('0100',8), int('0x40', 16)
(100, 64, 64)
>>> eval('100'), eval('0100'), eval('0x40')
(100, 64, 64)
>>> "%o %x %X" % (64, 64, 255)
'100 40 FF'
>>> import math
>>> math.pi, math.e
(3.1415926535897931, 2.7182818284590451)
>>> mash.sin(2 * math.pi / 180)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
NameError: name 'mash' is not defined
>>> maah.sin(2 * math.pi / 180)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
NameError: name 'maah' is not defined
>>> math.sin(2 * math.pi / 180)
0.034899496702500969
>>> abs(-42), 2**4, pow(2,4)
(42, 16, 16)
>>> int(2.567), round(2.567), round(2.567,2)
(2, 3.0, 2.5699999999999998)
>>>
c:\python>python
Python 2.3.5 (#62, Feb 8 2005, 16:23:02) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> (5/2),(5/2.0),(5/-2.0),(5/-2)
(2, 2.5, -2.5, -3)
>>> (5//2),(5//2.0),(5//-2.0),(5//-2)
(2, 2.0, -3.0, -3)
>>> (9/3),(9.0/3),(9//3),(9//3.0)
(3, 3.0, 3, 3.0)
>>> from __future__import division
File "<stdin>", line 1
from __future__import division
^
SyntaxError: invalid syntax
>>> (5/2),(5/2.0),(5/-2.0),(5/-2)
(2, 2.5, -2.5, -3)
>>> x = 1
>>> x << 2
4
>>> x | 2
3
>>> x & 1
1
>>> 1j * 1j
(-1+0j)
>>> 2 + 1j * 3
(2+3j)
>>> (2+1j)*3
(6+3j)
>>>
C:\>python
'python' は、内部コマンドまたは外部コマンド、
操作可能なプログラムまたはバッチ ファイルとして認識されていません。
システムのプロパティ
詳細設定
環境変数
システム環境変数
Pathに変数値C:\Python23を追加
c:\test\python>python
Python 2.3.5 (#62, Feb 8 2005, 16:23:02) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
print "dead parrot sketch\n";
c:\python>python threenames.py
dead parrot sketch
c:\python>python threenames.py
dead parrot sketch
c:\python>python
Python 2.3.5 (#62, Feb 8 2005, 16:23:02) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import threenames;
dead parrot sketch
>>> import threenames
>>> threenames.b, threenames.c
('parrot', 'sketch')
>>> from threenames import a,b,c
>>> b,c
('parrot', 'sketch')
>>> a
'dead'
>>> dir(threenames)
['__builtins__', '__doc__', '__file__', '__name__', 'a', 'b', 'c']
>>>
>>> a = 3
>>> b = 4
>>> a + 1, a - 1
(4, 2)
>>> b * 3, b / 2
(12, 2)
>>> a %2, b ** 2
(1, 16)
>>> 2 + 4.0, 2.0 ** b
(6.0, 16.0)
>>> b / 2 + a
5
>>> print b / (2.0 + a)
0.8
>>> b / (2.0+a)
0.80000000000000004
>>> print b / (2.0 + a)
0.8
>>> num = 1 / 3.0
>>> num
0.33333333333333331
>>> print num
0.333333333333
>>> "%e" % num
'3.333333e-001'
>>> "%2.2f" % num
'0.33'
>>>
# python test program
import sys
print sys.platform
print 2 ** 100
c:\python>python test1.py
win32
1267650600228229401496703205376
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