读取文件：

#直接读取

for line in open("d:\serverlist.txt"):
print(line)

#使用readline()方法读取

file = open(‘d:\serverlist.txt‘)
line = file.readline()
while line:
print(line,end=‘’)
file.close()

#使用read()方法读取

f = open("d:\out.txt",‘r‘)
mm=f.read()
f.close()
print(mm)

写入文件：

#新建或覆盖原文件写入
f = open("d:\out.txt", ‘w‘)
print("abc",file=f)
f.close()

#追加写入
f = open("d:\out.txt", ‘a‘)
print("abcdef",file=f)
f.close()

#使用write()方法写入
f = open("d:\out.txt",‘a‘)
f.write("\nnnnn")
f.close()