Python 使用字符串匹配对象
Python object matching using string
为什么我找不到匹配项?
>>> ti = "abcd"
>>> tq = "abcdef"
>>> check_abcd = re.compile('^abcd')
>>> if check_abcd.search(ti) is check_abcd.search(tq):
... print "Matching"
... else:
... print "not matching"
...
not matching
尽管变量 ti 和 tq 都匹配并且具有相同的引用
>>> print check_abcd.search(ti)
<_sre.SRE_Match object at 0x7ffbb05559f0>
>>> print check_abcd.search(tq)
<_sre.SRE_Match object at 0x7ffbb05559f0>
为什么不匹配?
`is` is identity testing, == is equality testing.
is will return True if two variables point to the same object, == if the objects referred to by the variables are equal.
您可能想要匹配 values
而不是 objects
。因此您可以使用
ti = "abcd"
tq = "abcdef"
check_abcd = re.compile('^abcd')
if check_abcd.search(ti).group(0) == check_abcd.search(tq).group(0):
print "Matching"
else:
print "not matching"
为什么我找不到匹配项?
>>> ti = "abcd"
>>> tq = "abcdef"
>>> check_abcd = re.compile('^abcd')
>>> if check_abcd.search(ti) is check_abcd.search(tq):
... print "Matching"
... else:
... print "not matching"
...
not matching
尽管变量 ti 和 tq 都匹配并且具有相同的引用
>>> print check_abcd.search(ti)
<_sre.SRE_Match object at 0x7ffbb05559f0>
>>> print check_abcd.search(tq)
<_sre.SRE_Match object at 0x7ffbb05559f0>
为什么不匹配?
`is` is identity testing, == is equality testing.
is will return True if two variables point to the same object, == if the objects referred to by the variables are equal.
您可能想要匹配 values
而不是 objects
。因此您可以使用
ti = "abcd"
tq = "abcdef"
check_abcd = re.compile('^abcd')
if check_abcd.search(ti).group(0) == check_abcd.search(tq).group(0):
print "Matching"
else:
print "not matching"