List items verification for Integer type

[vintysaw]

Hi All,

I want to verify if the list objects are integers are not. My code is failing at 0 index, when there is a float value or when there is a string value.

Please help.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

num=0 z=['11, 12, 14', '20', '21, 23', '24', 'man', '1', '27', '28', '29.1', '30'] mydefectlist=[] mydefectlist1=[] mydefectlist2=[]   while num < len(z):     z[num] = int(z[num])     num +=1   for s in z:     if (isinstance(s, int)):         flag=0         mydefectlist.append(s)         print('int values:',mydefectlist)     elif(isinstance(s, float)):         mydefectlist1.append(s)         print('float values:',mydefectlist1)     elif(isinstance(s, str)):         mydefectlist2.append(s)         print('string values:',mydefectlist2)     else:         print('please check the list again', s)

[perfringo]

As far as I understand there is conversion to int, not verification.

[sandeep_ganga]

Try this to see if that helps,

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

list1=['man12','11', '12', '14', '20', '21', '23', '24', 'man', '1', '27', '28', '29.1', '30'] mydefectlist=[] mydefectlist1=[] mydefectlist2=[]    for item in list1:     try:         if (isinstance(int(item), int)):             mydefectlist.append(item)     except ValueError:         try:             if (isinstance(float(item), float)):                 mydefectlist1.append(item)         except ValueError:             mydefectlist2.append(item)           print("int-->", mydefectlist) print("float-->", mydefectlist1) print("str-->", mydefectlist2)

Output:
python test1.py

int--> ['11', '12', '14', '20', '21', '23', '24', '1', '27', '28', '30']
float--> ['29.1']
str--> ['man12', 'man']

Best Regards,
Sandeep

GANGA SANDEEP KUMAR

[vintysaw]

Thanks Sandeep. This works for me. I guess, I was missing to use try-except. The ifelse logic wasn't working for me.

[perfringo]

One way (which does not require to define possible classes in chain of if-s) is to use defaultdict and class name:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

>>> import collections >>> lst = ['abc', 1, 2, 3, 4.3, [42]] >>> types = collections.defaultdict(list) >>> for item in lst: ...     types[type(item).__name__].append(item) ... >>> types defaultdict(list, {'str': ['abc'], 'int': [1, 2, 3], 'float': [4.3], 'list': [[42]]}) >>> for k, v in types.items(): ...     print(f'{k} --> {v}') ...                                                                 str --> ['abc'] int --> [1, 2, 3] float --> [4.3] list --> [[42]] >>> types['int']                                                    [1, 2, 3]