对文件操作流程如下：
1、打开文件，得到一个文件句柄并赋给一个变量
2、通过文件句柄对文件进行操作
3、关闭文件
4、为了必免打开文件忘记关闭，可以通过上下文管理，即：
with open("F:yesterday2","r",encoding="utf-8") as f:
for line in f:
print(line)
f = open("F:yesterday2","r",encoding="utf-8")
st = f.readline()
print(st)
f.close()
print("-------------------")
f1 = open("F:yesterday2","r",encoding="utf-8")
data = f1.read()
print(data)
print("-------------------")
f = open("F:yesterday2","r",encoding="utf-8") # 返回一个文件对象
line = f.readline() # 调用文件的 readline()方法
while line:
print(line, end = '') # 在 Python 3 中使用
line = f.readline()
f.close()
f = open("F:yesterday2","r",encoding="utf-8")
for i in range(5):
print(f.readline(),end="")
f.close()
print("-------------------")
f = open("F:yesterday2","r",encoding="utf-8")
lines = f.readlines() #读取全部内容 ，并以列表方式返回
for index,line in enumerate(lines):
print(index,line, end='') # 在 Python 3 中使用
f.close()
print("-------------------")
f =open("F:yesterday2","r",encoding="utf-8")
w = open("F:yesterday","w",encoding="utf-8")
line = f.readline()
while line:
w.write(line)
line = f.readline()
f.close()
w.close()
f = open("F:yesterday2","r",encoding="utf-8")
for line in f:
print(line)
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