如何在python 3.x中使用string.replace()

string.replace()在python 3.x上已弃用。新的方法是什么?

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replace()是python3中<class 'str'>的一个方法:

>>> 'hello, world'.replace(',', ':')
'hello: world'
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最佳答案

如2。x，使用str.replace()。

例子:

>>> 'Hello world'.replace('world', 'Guido')
'Hello Guido'
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试试这个:

mystring = "This Is A String"
print(mystring.replace("String","Text"))
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供你参考，当将一些字符附加到字符串中任意位置固定的单词时(例如，通过添加后缀以某方式将形容词变成副词)，你可以将后缀放在行末以提高可读性。为此，在replace()中使用split():

s="The dog is large small"
ss=s.replace(s.split()[3],s.split()[3]+'ly')
ss
'The dog is largely small'
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ss = s.replace(s.split()[1], +s.split()[1] + 'gy')
# should have no plus after the comma --i.e.,
ss = s.replace(s.split()[1], s.split()[1] + 'gy')
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python 3中的replace()方法被简单地用于:

a = "This is the island of istanbul"
print (a.replace("is" , "was" , 3))


#3 is the maximum replacement that can be done in the string#


>>> Thwas was the wasland of istanbul


# Last substring 'is' in istanbul is not replaced by was because maximum of 3 has already been reached
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你可以使用str.replace ()作为str.replace ()的链。假设你有一个像'Testing PRI/Sec (#434242332;PP:432:133423846,335)'这样的字符串，你想用'-'替换所有的'#',':',';','/'符号。你可以这样替换它(正常方式)，

>>> string = 'Testing PRI/Sec (#434242332;PP:432:133423846,335)'
>>> string = string.replace('#', '-')
>>> string = string.replace(':', '-')
>>> string = string.replace(';', '-')
>>> string = string.replace('/', '-')
>>> string
'Testing PRI-Sec (-434242332-PP-432-133423846,335)'

或这样(chain of str.replace ())

>>> string = 'Testing PRI/Sec (#434242332;PP:432:133423846,335)'.replace('#', '-').replace(':', '-').replace(';', '-').replace('/', '-')
>>> string
'Testing PRI-Sec (-434242332-PP-432-133423846,335)'
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简单替换:. Replace (old, new, count)。

text = "Apples taste Good."
print(text.replace('Apples', 'Bananas'))          # use .replace() on a variable
Bananas taste Good.          <---- Output


print("Have a Bad Day!".replace("Bad","Good"))    # Use .replace() on a string
Have a Good Day!             <----- Output


print("Mom is happy!".replace("Mom","Dad").replace("happy","angry"))  #Use many times
Dad is angry!                <----- Output
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Python 3的str.replace的官方文档

官方文件:Python 3的str.replace

Str.replace (old, new[， count])

返回字符串的副本，所有出现的子字符串old都替换为new。如果给出了可选参数count，则只替换第一次出现的计数。

对应VSCode的语法注意事项是:

enter image description here

str.replace(self: str, old, new, count) ->str

两个方法使用str.replace

  • 方法1:使用内置str的replace ->str.replace(strVariable, old, new[, count])
replacedStr1 = str.replace(originStr, "from", "to")
  • 方法二:使用str变量的replace ->strVariable.replace(old, new[, count])
replacedStr2 = originStr.replace("from", "to")

完整的演示

代码:

originStr = "Hello world"


# Use case 1: use builtin str's replace -> str.replace(strVariable, old, new[, count])
replacedStr1 = str.replace(originStr, "world", "Crifan Li")
print("case 1: %s -> %s" % (originStr, replacedStr1))


# Use case 2: use str variable's replace -> strVariable.replace(old, new[, count])
replacedStr2 = originStr.replace("world", "Crifan Li")
print("case 2: %s -> %s" % (originStr, replacedStr2))

输出:

case 1: Hello world -> Hello Crifan Li
case 2: Hello world -> Hello Crifan Li

截图:

enter image description here

我的相关(中文)帖子:【详解】Python 3中字符串的替换str.replace


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