python - ne peut pas concaténer « str » et « list » objets liste contient entier - Stack Overflow

I want my output to be:

"fileselection":[0, 1, 2, 3, 4, 5, 6, 7]

My code:

li=[0, 1, 2, 3, 4, 5, 6, 7]
st='"fileselection":'
print st+",".join(li)

It is currently complaining:

TypeError: sequence item 0: expected string, int found.

Just calling str() on the list makes the output you want:

>>> li = [0, 1, 2, 3, 4, 5, 6, 7]
>>> st = '"fileselection":'
>>> st + str(li)
'"fileselection":[0, 1, 2, 3, 4, 5, 6, 7]'

---

The problem you see is because the elements of li are integers, for joining them to a string you need first to cast them to str. You can do this by applying str() function via map():

>>> st + ','.join(map(str, li))
'"fileselection":0,1,2,3,4,5,6,7'

I want my output to be:

"fileselection":[0, 1, 2, 3, 4, 5, 6, 7]

My code:

li=[0, 1, 2, 3, 4, 5, 6, 7]
st='"fileselection":'
print st+",".join(li)

It is currently complaining:

TypeError: sequence item 0: expected string, int found.

Just calling str() on the list makes the output you want:

>>> li = [0, 1, 2, 3, 4, 5, 6, 7]
>>> st = '"fileselection":'
>>> st + str(li)
'"fileselection":[0, 1, 2, 3, 4, 5, 6, 7]'

---

The problem you see is because the elements of li are integers, for joining them to a string you need first to cast them to str. You can do this by applying str() function via map():

>>> st + ','.join(map(str, li))
'"fileselection":0,1,2,3,4,5,6,7'

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