python - how to determine an integer in a string list

i have a problem if i have a string list

for example :

token=[aaa,bbb,ccc,ddd,0,eee,40,ggg,5]

how can i do to check whether token[i] is an integer

i want to see if token[i] is integer

i will put it in to a new string list by i+1:number

ex if token[4]=0 i will put it into result[5]="5:0"

---

sorry for explain not clear
first if i have many data

ex
39, State-gov, 77516, Bachelors, 13, Never-married, Adm-clerical, Not-in-family, White, Male, 2174, 0, 40, United-States, <=50K
50, Self-emp-not-inc, 83311, Bachelors, 13, Married-civ-spouse, Exec-managerial, Husband, White, Male, 0, 0, 13, United-States, <=50K

second i need to convert those data into specific number
ex State-gov into 2:1 Self-emp-not-inc into 2:2

however i can convert string into number but i cannot convert number into number
ex if token[4]=0 i will put it into result[5]="5:0"

for line in lines:
    token=re.split(', ',line)

  for i in range(0,13,1):
    try:
        value = int(token[i])

    except ValueError:
        pass  
    if (token[14] in '<=50K.'):

        result.append('1')
    if (token[14] in '>50K.'):
        result[j].append('2')
    if (value == true):
        result.append('i+1:token[i]')
    if (token[i] in '?'):
        result.append('i+1:0')
    if(token[i] in 'State-gov'):
        result.append("2:1")
    if(token[i] in 'Self-emp-not-inc'):

        result.append('2:2')

Answer

You need to use isinstance if you want to check the type of entry , and if you have multitype elements in your list :

>>> token=['aaa','bbb','ccc','ddd',0,'eee',40,'ggg',5]
>>> ["{}:{}".format(i,j) for i,j in enumerate(token,1) if isinstance(j,int)]
['5:0', '7:40', '9:5']