[简明python教程]学习笔记2014-04-28 23:45:56

1.**表示求幂
2.//表示取整除
3.raw_input函数提供一个字符串
4.if/elif/else结尾处都有一个:号
5.python中没有switch语句
6.可以在while循环语句中使用一个else从句
7.局部变量、全局变量
8.只有在形参表末尾的那些参数可以有默认参数值，即你不能在声明函数形参的时候，先声明有默认值的形参而后声明没有默认值的形参。这是因为赋给形参的值是根据位置而赋值的。例如，def func(a, b=5)是有效的，但是def func(a=5, b)是 无效 的。
9.DocStrings:__doc__，两个下划线

cat break.py
#!/usr/bin/python
while True:
a=raw_input('enter some words:')
print 'your enter is:',a,'length is :',len(a)
if a=='reed':
break
print 'done'
cat continue.py
#!/usr/bin/python
while True:
a=raw_input('enter some word: ')
print 'your enter is :',a
if a=='reed':
break
if len(a)<3:
print '33333'
continue

cat expression.py
#!/usr/bin/python
l=5
b=2
a=l*b
print 'a is',a
print '2*a',2*(l*b)
cat for.py
#!/usr/bin/python
for i in range(1,10):
print i
else:
print 'over'
cat func_default.py
#!/usr/bin/python
def say(message,times=1):
print message*times
say('hello')
say('world',5)
cat func_doc.py
#!/usr/bin/python
def printMax(x,y):
'''dasdsadsadsaa'''
x=int(x)
y=int(y)
if x>y:
print 'x is maximum'
else:
print 'y is maximum'
print printMax.__doc__
printMax(1,2)
cat func_global.py
#!/usr/bin/python
def func():
global x
print 'x is ',x
x=2
print 'changed local x to ',x
x=40
func()
print 'value of x is ',x
cat func_key.py
#!/usr/bin/python
def func(a,b=5,c=10):
print 'a is',a,'b is',b,'c is',c
func(3,7)
func(24,c=24)
func(a=50,c=100)
cat func_local.py
#!/usr/bin/python
def func(x):
print 'x is ',x
x=2
print 'changed local x to ',x
x=111
func(x)
print 'x is still ',x
cat func_param.py
#!/usr/bin/python
def printMax(a,b):
if a>b:
print a,'is maximum'
elif a==b:
print 'a is eq b'
else:
print b,'is maximum'
printMax(3,2)
printMax(2,2)
printMax(2,11)
cat func_return.py
#!/usr/bin/python
def maximum(x,y):
if x>y:
return x
else:
return y
print maximum(2,3)
cat function1.py
#!/usr/bin/python
def sayHello():
print 'hello,reed'
sayHello()
cat HelloWorld.py
#!/usr/bin/python
print "Hello,world!"
cat if.py
#!/usr/bin/python
number=23
guess=int(raw_input('enter an integer:'))
if guess==number:
print 'good'
elif guess<number:
print 'small'
else:
print 'big'
print 'done'
cat while.py
#!/usr/bin/python
number=23
flag=True
while flag:
guess=int(raw_input('enter an integet:'))
if guess==number:
print 'goooood'
flag=False
elif guess<number:
print 'small'
else:
print 'big'
else:
print 'over'
print 'done'1，

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