6-18 0:00 -0:30结束，day 12开始 6.24开始完成习题

Posted 2020-11-19 yikedashuyikexiaocao

test = "axoxiuxbxfxrexds"
v = test.partition("x")#分割3份
v1=test.rpartition("x")
v2=test.split("x",3)#x会丢失
v3=test.rsplit("x",4)

print(v)
print(v1)
print(v2)
print(v3)//(‘a‘, ‘x‘, ‘oxiuxbxfxrexds‘), (‘axoxiuxbxfxre‘, ‘x‘, ‘ds‘),[‘a‘, ‘o‘, ‘iu‘, ‘bxfxrexds‘][‘axoxiu‘, ‘b‘, ‘f‘, ‘re‘, ‘ds‘]

#只能根据
分割， True False 显示换行符
test = "axo
iu
xbxf
xrexds"
v=test.splitlines(True)
v1=test.splitlines(False)
print(v)
print(v1)//[‘axo
‘, ‘iu
‘, ‘xbxf
‘, ‘xrexds‘],[‘axo‘, ‘iu‘, ‘xbxf‘, ‘xrexds‘]

test ="fdg"
v=test.swapcase()
print(v)
v1=v.swapcase()
print(v1)//大小写互换

#索引下标，获取字符串中的某一个字符
test ="fdfdfg"
v=test[2]
print(v) f
切片

test ="fdfdfggrg"
v=test[2:5]#2<=   5<
print(v)//fdf

test ="郑建伟"
v=len(test)
print(v)Python 3是 3  Python 2.7 是9