目录
（1）语法：str.replace(old_str,new_str[,max_num])
1.replace函数的语法和用法
（1）语法：str.replace(old_str,new_str[,max_num])
old_str：必选，旧的字符串，就是被替代的目标字符串。
new_str：必选，新的字符串，就是转为的目标字符串。
max_num：可选，指定替代次数。不填，默认为无数次。
（2）用法：将指定字符串替代为目标字符串。
kips：该replace函数主要运用在某字段列中，替代具有一定规律的字符串。
2.实例
（1）简单的用法
#①
string='Hello Amy,welcome to our world'
new_string = string.replace('our','my')
new_string
#输出结果：'Hello Amy,welcome to my world'
#②
string1='Hello Amy,welcome to my world,your world,his world,her world,our world'
new_string1 = string1.replace('world','place')
new_string1
#输出结果：'Hello Amy,welcome to my place,your place,his place,her place,our place'
#③
string2='Hello Amy,welcome to my world,your world,his world,her world,our world'
new_string2 = string1.replace('world','place',4)
new_string2
#输出结果：'Hello Amy,welcome to my place,your place,his place,her place,our world'
#解释：①和②例子第三个参数默认为无数个，即可以替代无数个，③设置次数表示只能替代4个（2）与一些函数结合使用
①与input函数结合使用
old_str = 'I'
new_str = 'all'
string = input('请输入需要调整的字符串：')
new_string = string.replace(old_str,new_str)
print(new_string)
#iput：
'Forever young,I want to be forever young.Forever young,I want to be forever young.So many dreams swinging out of blue.We let them come true.'
#output：
'Forever young,all want to be forever young.Forever young,all want to be forever young.So many dreams swinging out of blue.We let them come true.'②与input函数和if函数结合使用
old_str = 'I'
new_str = 'all'
string = input('请输入需要调整的字符串：')
if 'I' in string:
new_string = string.replace(old_str, new_str)
print(new_string)
elif 'We'in string:
new_string = string.replace('We', 'all of us')
print(new_string)
else:
new_string = string.replace('We', 'I')
print(new_string)
#input：
请输入需要调整的字符串：'Forever young,I want to be forever young.Forever young,I want to be forever young.So many dreams swinging out of blue.We let them come true.'
#output:
'Forever young,all want to be forever young.Forever young,all want to be forever young.So many dreams swinging out of blue.We let them come true.'
③与input函数、while函数和if函数结合使用
old_str = 'I'
new_str = 'all'
while True:
string = input('请输入需要调整的字符串：')
if 'I' in string:
new_string = string.replace(old_str, new_str)
print(new_string)
elif 'We'in string:
new_string = string.replace('We', 'all of us')
print(new_string)
else:
new_string = string.replace('We', 'I')
print(new_string)
#①第一个循环
请输入需要调整的字符串：'Forever young,I want to be forever young.Forever young,I want to be forever young.So many dreams swinging out of blue.We let them come true.'
#输出结果为：
'Forever young,all want to be forever young.Forever young,all want to be forever young.So many dreams swinging out of blue.We let them come true.'
#②第二个循环
请输入需要调整的字符串：'I want to go into your heart,let me live into there'
#输出结果：
'all want to go into your heart,let me live into there'
请输入需要调整的字符串：
#一直循环输入。。。。参考文章
具体input函数用法可参考文章：python的input函数用法_小白修炼晋级中的博客-CSDN博客_python中input的用法
具体if判断语句用法可参考：python的if条件语句的用法及实例_小白修炼晋级中的博客-CSDN博客_python的if条件