![](/img/trans.png)
[英]How can I replace two different sub strings in a string by using re.sub() in python?
[英]How can re.sub() mutate immutable Python strings?
這里,字符串flight_details
字符串被更改但其 id 沒有更改,以下是代碼及其輸出:
import re
flight_details = "Flight Savana Airlines a2134"
print(id(flight_details))
print(re.sub(r"Flight", r"Plane", flight_details))
print(id(flight_details))
print(re.sub(r"Plane", r"Akash", flight_details))
print(id(flight_details))
輸出:
27264016
Plane Savana Airlines a2134
27264016
Flight Savana Airlines a2134
27264016
id(flight_details)
在調用re.sub
后返回相同的值,因為re.sub
不會更改您傳遞給它的字符串的值 ( flight_details
)。 它返回一個新字符串。
例如:
import re
flight_details = "Flight Savana Airlines a2134"
print(flight_details)
print(id(flight_details))
re.sub(r"Flight", r"Plane", flight_details)
print(flight_details)
print(id(flight_details))
flight_details = re.sub(r"Flight", r"Plane", flight_details)
print(flight_details)
print(id(flight_details))
輸出:
Flight Savana Airlines a2134
1442959741216
Flight Savana Airlines a2134
1442959741216
Plane Savana Airlines a2134
1442959741456
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.