左移一個Python整數產生不正確的結果

Question

誰能解釋這Python代碼如何：

print "bits_received:", bits_received 
tmp = 0 
print type(tmp) 
tmp = (1 << bits_received) 
print type(tmp) 
print "tmp: 0x{:X}".format(tmp) 

會產生這樣的結果：

bits_received: 95 
<type 'int'> 
<type 'numpy.int64'> 
tmp: 0x80000000 

Answer 1

user2357112是正確的：

bits_received: 88 <type 'int'> 
bits_received: 95 <type 'numpy.int64'> 

的bits_received變量正從它的類型變爲int至numpy.int64，通過添加另一種類型的變量numpy.int64。用「int（...）」包裝其他變量解決了我的問題。

謝謝，user2357112！