数字类型转换

>>> int( 4.2555 )
4
>>> long( 42 )
42L
>>> floag( 4 )
4.0
>>> complex( 4 )
( 4 + 0j )
>>> complex( 2.4, -8 )
( 2.4 - 8j )
>>> complex( 2.3e - 10, 45.3e4 )
( 2.3e - 10 + 45300j )




int( obj, base = 10 )
第二个参数代表进制


long( obj, base = 10 )


float( obj )


complex( str ) or complex( real, inag = 0.0 )