Python1：if / while / for...in / break /continue

1.使用if语句

#if.pynumber = 23;guess = int(raw_input('Enter an integer:'));if guess == number:    print 'congratulations, u guessed it';    print 'but u dont win any prize';elif guess < number:    print 'no,it is a little heigher than that';else:    print 'no,it is a little lower than that';print 'Done';

2.使用while语句

#while.pynumber = 23;running = 1;while running:    guess = int(raw_input('Enter an integer:'));    if guess == number:        print 'congratulations, u guessed it';        running = 0;    elif guess < number:        print 'terribly,it is a little lower than that';    else:        print 'terribly,it is a little heigher than that';else:    print 'that while loop is over';print 'Done';

3.使用for...in语句

#for.pyfor i in range(1,5):    print i;else:    print 'the for loop is over';

4.使用break语句

#break.pywhile True:    s = raw_input('Enter something:');    if s == 'quit':        break;    print 'Length of the string is : ' , len(s);print 'Done';

5.使用Continue语句

continue语句用来告诉Python条股当前循环块中的剩余语句，然后继续执行下一轮循环。

#break.pywhile True:    s = raw_input('Enter something:');    if s == 'quit':        break;    if len(s) < 3:        continue;    print 'Input is of sufficient length';