Python_流程控制
2016年3月8日12:47:35_1.0
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[root@localhost bayaim]# cat bai.py
#!/usr/bin/python
def fun():
return 0
x= int(raw_input("please input x:"))
y= int(raw_input("please input y:"))
if x>90:
if y>=90:
print "A"
print "x>=90"
elif x>=80:
print "80"
elif x>=70:
print "C"
else:
print "bad"
[root@localhost bayaim]#
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AND OR NOT 逻辑运算符 （bayaim 和数学中理解是一样的）
FOR 循环 是一个结构，导致一个程序重要一定次数
条件循环也是如此，当条件为假，循环结束。
#!/usr/bin/python
for x in range(100):
print x,"********hello world*********"
~
range (1,10,2) 1 为 起始值，10 为终止值，2 为步进值————————————
[root@localhost bayaim]# cat bai2.py
#!/usr/bin/python
num = 0
for x in range(1,101):
num +=x
print num
[root@localhost bayaim]# ./bai2.py
5050
遍历————————————————————————
[root@localhost bayaim]# cat bianli.py
#!/usr/bin/python
s ="hello world"
l =[1,2,3,'a','b']
t =(7,8,9,'x','y')
d ={1:111,2:222,5:555,3:333}
for x in d:
print x
[root@localhost bayaim]# python bianli.py
1
2
3
5
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[root@localhost bayaim]# cat bianli.py
#!/usr/bin/python
s ="hello world"
l =[1,2,3,'a','b']
t =(7,8,9,'x','y')
d ={1:111,2:222,5:555,3:333}
for x in d:
print d[x]
print d.items()
[root@localhost bayaim]# python bianli.py
111
222
333
555
[(1, 111), (2, 222), (3, 333), (5, 555)]
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[root@localhost bayaim]# cat bianli.py
#!/usr/bin/python
s ="hello world"
l =[1,2,3,'a','b']
t =(7,8,9,'x','y')
d ={1:111,2:222,5:555,3:333}
for x in d:
print d[x]
for k,v in d.items():
print k
print v
[root@localhost bayaim]# python bianli.py
111
222
333
555
1
111
2
222
3
333
5
555
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利用周末：
我把
“循环控制”——“ for”
“流程控制”—— "while"
“定义和调用” ——def()
"函数形参实参默认参数"
以上4个看完了，这里就直接跳过了。。。。O(∩_∩)O~
<<2016-3-14 09:26:03 bayaim.datetime>>
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