我陷入这样的情况：我有一个列表，但我想更改子网/21 to /24.
x = ['192.168.8.1/21', '192.168.4.36/24', '192.168.47.54/16']
for a in x:
if "21" in (a[-2:]):
print(a)
else:
print("carry on")
现在它正在打印正确的值，但我如何更改值a[-2:] 21 to 24我不明白。
Output:
192.168.8.1/21
carry on
carry on
您无法更改字符串的一部分，因为字符串是不可变的。但您可以用更正的版本替换该字符串。
x = ['192.168.8.1/21', '192.168.4.36/24', '192.168.47.54/16']
# we use enumerate to keep track of where we are in the list
# where i is just a number
for i, a in enumerate(x):
# we can use a string method to check the ending
if a.endswith('/21'):
print('Replacing "/21" in "{}" with "/24"'.format(a))
# here we actually update the list with a new string
x[i] = a.replace('/21', '/24')
else:
print("carry on")
#output:
Replacing "/21" in "192.168.8.1/21" with "/24"
carry on
carry on
如果你检查什么x is now:
x
#output:
['192.168.8.1/24', '192.168.4.36/24', '192.168.47.54/16']
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