PythonDay6

每日一记

字符串的相关操作

'''
#字符串截取
s = "hello"
print(s[0:3])
print(s[:])
print(s[::-1])

#去空格
s = " hello "
#去左右的空格
print(s.strip())
print(s.lstrip())
print(s.rstrip())

#字符串赋值
s = "hello"
s_copy = s
print(s_copy)

#字符串拼接
s = "hello"
s1 = "python"
s2 = s + s1
print(s2)

# import operator   拼接
import operator
s = "hello"
s1 = "python"
s2 = operator.concat(s,s1)
print(s2)
b = operator.lt(s,s1)
print(b)

#求字符串长度
s = "hello"
s1 = "python"
print(len(s),len(s1))
s = "hello"
s1 = "python"
print(max(s),min(s1))
#字符串大小写转换
#upper             转换为大写
#lower              转为小写
#title              转换为标题
#capitalize             首字母大写
#swapcase               大写变小写，小写变大写
s = "asfDFGf   how  are  you"
print(s.upper())
print(s.lower())
print(s.title())
print(s.capitalize())
print(s.swapcase())
#字符串分割
s = "asfDFGf how  are  you"
ss = s.split("o")
print(ss)
#字符串序列连接
s = "asfDFGf how  are  you"
s1 =  "ghjkl"
s2 = s.join(s1)
print(s2)

a = ["hello","world"]
str = "-"
print(str.join(a))

#字符串内查找
s1 = 'today is a fine day'
index = s1.find("is",3,5)
print(index)
#查不到就返回-1  查到了就返回查到的首次的下标

#字符串内替换
s1 = 'today is a fine day is is is is is '
s = s1.replace("is","are",2)
print(s,s1)

#字符串判断
a = "asd"
a.isdigit() #是否由数字构成
a.isalnum() #是否由数字或字母构成
a.isalpha() #是否由字母构成
a.islower() #是否是大写   
a.isupper() #是否是小写
a.isspace() #是否由空格构成    
a.istitle() #是否是标题