Question

假设一个包含＆＃34; i = 1＆＃34;的文本文件，我想阅读＆＃34; 1＆＃34;并将其分配给某个变量。那么我怎么能忽略，直到等号然后检索数字？

Answer 1

如果文本文件的格式类似于python文件，则可以使用exec("file contents")甚至import文件。大多数人因为它的漏洞而对exec()感到不满：除非你自己编写代码，否则你不知道你运行的代码是什么。

如果您是将将变量放入文件的人，那么我强烈建议您查看pickle。它允许您将python对象和“dump”它们放入一个文件中供以后检索 - 您可以创建一个具有self.i = 1等属性的对象，并且它将在运行中保留。

直接回答您的问题：

#assuming only variables formatted as "variable = value" in file
#assuming only one variable per line
variables = { }
with open("my_variables.txt", "r") as f:
    #iterates through each line
    for line in f:
        #for each line, splits it at the '=' into two parts
        # and gets first half (before the '=') and strips it of any spaces
        # before or after it the variable, then stores it as 'name'
        name = line.split("=")[0].strip()
        #gets second half and stores it as 'value' the same way
        value = line.split("=")[1].strip()
        #if the values are always integers you can convert them
        # from strings to integers:
        value = int(value)
        #stores both variable name and value into the 'variables' dictionary
        variables[name] = value
print(variables) # prints { 'i' : '1' }

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