How can I convert each item in the list to string, for the purpose of joining them?

user_429507 0
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I need to join a list of items. Many of the items in the list are integer values returned from a function; i.e.,

myList.append(munfunc())

How should I convert the returned result to a string in order to join it with the list?

Do I need to do the following for every integer value:

myList.append(str(myfunc()))

Is there a more Pythonic way to solve casting problems?

list python string
9 Answers

For example:

lst_points = [[313, 262, 470, 482], [551, 254, 697, 449]]

lst_s_points = [" ".join(map(str, lst)) for lst in lst_points]
print lst_s_points
# ['313 262 470 482', '551 254 697 449']

As to me, I want to add a str before each str list:

# here o means class, other four points means coordinate
print ['0 ' + " ".join(map(str, lst)) for lst in lst_points]
# ['0 313 262 470 482', '0 551 254 697 449']

Or single list:

lst = [313, 262, 470, 482]
lst_str = [str(i) for i in lst]
print lst_str, ", ".join(lst_str)
# ['313', '262', '470', '482'], 313, 262, 470, 482

lst_str = map(str, lst)
print lst_str, ", ".join(lst_str)
# ['313', '262', '470', '482'], 313, 262, 470, 482
user_63290060

How come no-one seems to like repr?
python 3.7.2:

>>> int_list = [1, 2, 3, 4, 5]
>>> print(repr(int_list))
[1, 2, 3, 4, 5]
>>>

Take care though, it's an explicit representation. An example shows:

#Print repr(object) backwards
>>> print(repr(int_list)[::-1])
]5 ,4 ,3 ,2 ,1[
>>>

more info at pydocs-repr

user_67534020
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