python:为什么替换不起作用？

Question

我编写了一个快速脚本，用于从保存在 Excel 列中的网站地址列表中删除“http://”子字符串。函数替换虽然不起作用，但我不明白为什么。

from openpyxl import load_workbook

def rem(string):
    print string.startswith("http://")    #it yields "True"
    string.replace("http://","")
    print string, type(string)    #checking if it works (it doesn't though, the output is the same as the input)

wb = load_workbook("prova.xlsx")
ws = wb["Sheet"]

for n in xrange(2,698):
    c = "B"+str(n)
    print ws[c].value, type(ws[c].value)   #just to check value and type (unicode)
    rem(str(ws[c].value))    #transformed to string in order to make replace() work

wb.save("prova.xlsx")    #nothing has changed

Answer 1

String.replace(substr)

原地不发生，改成:

string = string.replace("http://","")