python - 使用python修改文本文件中的变量值

Question

我有一个包含以下内容的文本文件；

variable_1 = 1;
variable_2 = 2;
variable_3 = 3;
variable_4 = 4;

使用Python，我想将variable_2修改为22，将variable_3修改为33，这样文本文件将如下所示；

variable_1 = 1;
variable_2 = 22;
variable_3 = 33;
variable_4 = 4;

如何使用 python v3.8 来完成此操作？

Answer 1

urls = open('variables.txt', 'r')
lines = urls.readlines()  # read all the lines of txt
urls.close()

for index, line in enumerate(lines):  # iterate over each line
    if index == 1:
        line_split = line.split(';')
        line = line_split[0] + '2;\n'
    if index == 2:
        line_split = line.split(';')
        line = line_split[0] + '3;\n'
    lines[index] = line

with open('variables.txt', 'w') as urls:
    urls.writelines(lines)  # save all the lines