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读取hello.py文件，文件中的内容如下：
#!/usr/bin/env python3
print("Hello world")
print(1+2+3)
print(2 ** 100)
input()读取方式
>>> for line in open('E:\Python\hello.py'):
print(line, end=' ')
#!/usr/bin/env python3
print("Hello world")
print(1+2+3)
print(2 ** 100)
input()
>>> f = open('E:\Python\hello.py')
>>> while True:
line = f.readline()
if not line: break
print(line, end=' ')
#!/usr/bin/env python3
print("Hello world")
print(1+2+3)
print(2 ** 100)
input() __next__
>>> f = open('E:\Python\hello.py')
>>> f.__next__()
'#!/usr/bin/env python3\n'next(X)
>>> f = open('E:\Python\hello.py')
>>> next(f)
'#!/usr/bin/env python3\n'
>>> next(f)
'\n'readline()
>>> f = open('E:\Python\hello.py')
>>> f.readline()
'#!/usr/bin/env python3\n'