浅谈Python基础—判断和循环

判断

缩进代替大括号。

冒号（:）后换号缩进。

if

test=100if test>50: print('OK')print('test')

if-elif-else

test=50if test>200: print('200')elif test<100: print('100')else: print('100-200')

列表

test1=[123,456,789]if 123 in test1: print('OK')

字典

test2={'hello':123,'world':456}if 'hello' in test2: print('OK')

循环

while

数值

test=0while test<10: print(test) test+=1

集合

test1=set(['hello','world'])while test1: test2=test1.pop() print(test2)

for

集合

test3=set(['hello','world'])for t in test3:#相当于foreach print(t)

列表

test4=[123,456,789]for i in range(3): print(test4[i])

test5=[123,456,789,34,5435,26,2362,262,26,5]for i in range(len(test5)): print(test5[i])

continue

test6=[11,12,13,14,15,16,17,18,19,20]for i in test6: if i%2==0:  print(i)  else:  continue print(i)

break

test7=[12,13,14,15,16,17,18,19,20]for i in test7: if i%2==0:  print(i)  else:  break print(i)

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