python中str()函数转换字符串

class str(object='')

>>> s = 'Hello, world.'

>>> str(s)

'Hello, world.'

>>> repr(s)

"'Hello, world.'"

>>> str(1/7)

'0.14285714285714285'

>>> x = 10 * 3.25

>>> y = 200 * 200

>>> s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'

>>> print(s)

The value of x is 32.5, and y is 40000...

>>> # The repr() of a string adds string quotes and backslashes:

... hello = 'hello, world\n'

>>> hellos = repr(hello)

>>> print(hellos)

'hello, world\n'

>>> # The argument to repr() may be any Python object:

... repr((x, y, ('spam', 'eggs')))

"(32.5, 40000, ('spam', 'eggs'))"