Python基础——判断和循环
- 2020 年 1 月 16 日
- 笔记
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)
