open("","r")與open("","rb")的效率區別

fd = open("C:\Users\william\Desktop\dup_file - Copy (3).txt","r")
for i in fd:
print i

耗時 25.6074296742s

 

fd = open("C:\Users\william\Desktop\dup_file - Copy (3).txt","rb")
for i in fd:
print i

耗時 60.840389834

有文章提到說在windows系統中，要加上rb，不然代碼會很慢，但經過上面，發現rb明顯更慢。