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=100

if test>50:

 print('OK')

print('test')





if-elif-else





test=50

if 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=0

while 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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