python3之数组（array）

Type code      C Type     Minimum size in bytes
     ‘b‘    signed integer           1
     ‘B‘    unsigned integer         1
     ‘u‘    Unicode character        2 
     ‘h‘    signed integer           2
     ‘H‘    unsigned integer         2
     ‘i‘    signed integer           2
     ‘I‘    unsigned integer         2
     ‘l‘    signed integer           4
     ‘L‘    unsigned integer         4
     ‘q‘    signed integer           8 
     ‘Q‘    unsigned integer         8 
     ‘f‘    floating point           4
     ‘d‘    floating point           8

>>> from array import array 
>>> from random import random
>>> floats = array(‘d‘, (random() for i in range(10**7)))
>>> floats[-1]
0.021901117799701275

>>> fp = open(‘floats.bin‘, ‘wb‘)
>>> floats.tofile(fp)
>>> fp.close()

>>> floats_2 = array(‘d‘)
>>> fp = open(‘floats.bin‘, ‘rb‘)
>>> floats_2.fromfile(fp, 10**7)
>>> fp.close()
>>> floats_2[-1]
0.021901117799701275

>>> floats_2 == floats
True

>>> import array
>>> a = array.array(a.typecode, sorted(a))