io编程

try:
    f = open('F:/PyWorkSpace/test.txt', 'r')
    print(f.read())
finally:     
    if f:
        f.close()  # 文件使用完之后必须关闭
    
# 简化写法
with open('F:/PyWorkSpace/test.txt', 'r') as f:    # with语句会自动帮助我们调用close()方法
    for line in f.readlines():
        print(line.strip())   # 把末尾的'n'删掉