如何检查for循环中的下一个符号(字符)

Question

with open("Base_Of_Cars", 'r') as File:
for symbol in File[::-1]:
if symbol == "№"

在这段代码中，我应该返回符号就在"№">之后。此外，您可以看到for循环由于[::-1]，正在反向执行。，所以我需要从末尾找到.

Answer 1

可以设置一个变量prev_char = symbol来跟踪symbol的前一个字符。检查symbol是否等于№:

with open("Base_Of_Cars", 'r') as File:
for symbol in File[::-1]:
if symbol == "№":
# Do something
print(prev_char)
prev_char = symbol