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win7的环境变量清理起来太麻烦，所以写了两个模块来帮助清理
with open(r'C:\Users\Administrator\Desktop\12.txt','r') as f:
a = f.read().split(';')
for i in a:
with open(r'C:\Users\Administrator\Desktop\123.txt','a') as fw:
fw.write(i + '\n')
with open(r'C:\Users\Administrator\Desktop\123.txt','r') as f:
for i in f.readlines():
with open(r'C:\Users\Administrator\Desktop\1234.txt','a') as fw:
fw.write(i.strip() + ';')