python3 字符串截取
string = 'WhereIsMyBook?'
str1 = string[:]
str2 = string[5]
str3 = string[-2]
str4 = string[5:]
str5 = string[:7]
str6 = string[2:6]
str7 = string[-3:-1]
str8 = string[-4:]
str9 = string[:-5]
print(str1)
print(str2)
print(str3)
print(str4)
print(str5)
print(str6)
print(str7)
print(str8)
print(str9)
执行结果：
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