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')

Python 3的str.replace的官方文档

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。

对应的VSCode的语法注意如下:

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

两种方法使用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。替换(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:

My related (Chinese) post: str.replace String in Python 3

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

你可以使用str.replace()作为str.replace()的一个链。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)'

或者这样(str.replace()的链)

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

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

如2。X，使用str.replace()。

例子:

>>> 'Hello world'.replace('world', 'Guido')
'Hello Guido'