問題描述
我試過了
from mock import Mock
import __builtin__
__builtin__.print = Mock()
但這會引發(fā)語法錯誤.我也試過這樣修補(bǔ)它
But that raises a syntax error. I've also tried patching it like so
@patch('__builtin__.print')
def test_something_that_performs_lots_of_prints(self, mock_print):
# assert stuff
有沒有辦法做到這一點(diǎn)?
Is there any way to do this?
推薦答案
print 是 python 2.x 中的關(guān)鍵字，將其用作屬性會引發(fā) SyntaxError.您可以通過在文件開頭使用 from __future__ import print_function 來避免這種情況.
print is a keyword in python 2.x, using it as attribute raises a SyntaxError. You can avoid that by using from __future__ import print_function in the beginning of the file.
注意:你不能簡單地使用 setattr，因?yàn)槟阈薷牡拇蛴『瘮?shù)不會被調(diào)用，除非 print 語句被禁用.
Note: you can't simply use setattr, because the print function you modified doesn't get invoked unless the print statement is disabled.
您還需要 from __future__ import print_function 在您希望使用修改后的 print 函數(shù)的每個文件中，否則它將被 打印語句.
you also need to from __future__ import print_function in every file you want your modified print function to be used, or it will be masked by the print statement.
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