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Python13 期字符串大考核！！！
2020-07-24 10:55s="sdSdsfdAdsdsdfsfdsdASDSDFDSFa"
print(s.upper())
print(s.lower())
print(s.swapcase())print("替换前:",s)
s_1=s.replace('s','h')
s_2=s_1.replace('S','H')
s_3=s_2.replace('f','u')
s_4=s_3.replace('A','Z')
s_5=s_4.replace('D','W')
s_6=s_5.replace('F','U')
s_7=s_6.replace('d','w')
s_8=s_7.replace('a','z')
print("替换后:",s_8)