Friday 27 December 2019
python - How to detect non-number of the list?
Answer
Answer
Suppose I have a list as the following:
a = ['111', 213, 74, '99', 't', '88', '-74', -74]
The list contains number-like string, number and string of the data types.
I consider number-like string can convert number, so it's can see as a number.
This is my method:
a = ['111', 213, 74, '99', 't', '88', '-74', -74]
def detect(list_):
for element in list_:
try:
int(element)
except ValueError:
return False
return True
print detect(a)
But it looks so lengthy and unreadable, so anyone has better method to detect it?
Additionally, my list contains negative number and negative-number-like string, how do I do?
Answer
For only positive integers:
not all(str(s).isdigit() for s in a)
For negatives:
not all(str(s).strip('-').isdigit() for s in a)
For decimals and negatives:
not all(str(s).strip('-').replace('.','').isdigit() for s in a)
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