I supose you are working on python 3. In Python 2, dictionaries had a has_key()
method. In Python 3, as the exception says, it no longer exists. You need to use the in
operator:
if 'SERVER_SOFTWARE' in os.environ
here you have an example (py3k):
>>> import os
>>> if 'PROCESSOR_LEVEL' in os.environ: print(os.environ['PROCESSOR_LEVEL'])
6
>>> if os.environ.has_key('PROCESSOR_LEVEL'): print("fail")
Traceback (most recent call last):
File "<pyshell#18>", line 1, in <module>
if os.environ.has_key('PROCESSOR_LEVEL'): print("fail")
AttributeError: '_Environ' object has no attribute 'has_key'
>>>
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…