If I were to have the following list:
lst = ['3', '7', 'foo', '2.6', 'bar', '8.9']
how would I convert all possible items into either ints or floats accordingly, to get
lst = [3, 7, 'foo', 2.6, 'bar', 8.9]
thanks in advance.
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1Loop over each item and make an attempt to convert. If the conversion fail then ignore the item.iBug– iBug2018-01-25 11:07:16 +00:00Commented Jan 25, 2018 at 11:07
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use a foreach, iterate over all items. try convert item to int, catch error then ignore it (or nest another try) then repeat for the whole list. do some research on documentations!L_Church– L_Church2018-01-25 11:08:19 +00:00Commented Jan 25, 2018 at 11:08
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2FWIW, it's generally not a great idea to have a mixture of datatypes in a list. Code to process such lists tends to get messy and require explicit type testing which goes against Python's duck-typing philosophy.PM 2Ring– PM 2Ring2018-01-25 11:20:23 +00:00Commented Jan 25, 2018 at 11:20
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2 Answers
Loop over each item and make an attempt to convert. If the conversion fail then you know it's not convertible.
def tryconvert(s):
try:
return int(s)
except ValueError:
try:
return float(s)
except ValueError:
return s
lst = ['3', '7', 'foo', '2.6', 'bar', '8.9']
newlst = [tryconvert(i) for i in lst]
print(newlst)
Output:
[3, 7, 'foo', 2.6, 'bar', 8.9]
Try something like this :
lst = ['3', '7', 'foo', '2.6', 'bar', '8.9']
for j,i in enumerate(lst):
if i.isdigit():
lst[j]=int(i)
elif '.' in i:
lst[j]=float(i)
output:
[3, 7, 'foo', 2.6, 'bar', 8.9]
1 Comment
iBug
This is going to fail if the list contains a string like
'A.B'