python学习笔记

1.if语句（python中没有switch语句，可用if……elif……else代替）

格式：

　　if 表达式：

　　　　#语句

　　else：

　　　　#语句

eg：

number = 23
guess = int(raw_input('Enter an integer:'))

if guess == number:
    print'Congratulations'
    print'but you do not win any prizes!'
elif guess < number:
    print'No,it is higher'
else:
    print'NO,it is lower'
print'Done'

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2.while语句

格式：

while <test>:

　　#语句

else：#可跟else从句

eg:

 1 number = 23
 2 running = True
 3 
 4 while running:
 5     guess = int(raw_input('Enter an integer:'))
 6     if guess == number:
 7         print'Congratulations'
 8         running = False
 9     elif guess < number:
10         print'it is higher'
11     if guess > number:
12         print'it is lower'
13 else:
14     print'The while loop is over.'
15 
16 print'Done'

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3.for语句格式：

for <var> in range(<begin>,<end>):

　　#语句

1 for i in range(1,5):
2     print i
3 else:
4     print "The for loop is over"

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转载于:https://www.cnblogs.com/shijianupc/p/3798912.html