Q:

Python - printing out list separated with comma

I am writing a piece of code that should output a list of items separated with a comma. The list is generated with a for loop. I use the 
for x in range(5):
    print(x, end=",")

The problem is I don't know how to get rid of the last comma that is added with the last entry in the list. It outputs this:
0,1,2,3,4,

How do I remove the ending ' , ' ?

A:

Pass sep="," as an argument to print()
You are nearly there with the print statement. 
There is no need for a loop, print has a sep parameter as well as end.
>>> print(*range(5), sep=", ")
0, 1, 2, 3, 4

A little explanation
The print builtin takes any number of items as arguments to be printed. Any non-keyword arguments will be printed, separated by sep. The default value for sep is a single space.
>>> print("hello", "world")
hello world

Changing sep has the expected result.
>>> print("hello", "world", sep=" cruel ")
hello cruel world

Each argument is stringified as with str(). Passing an iterable to the print statement will stringify the iterable as one argument.
>>> print(["hello", "world"], sep=" cruel ")
['hello', 'world']

However, if you put the asterisk in front of your iterable this decomposes it into separate arguments and allows for the intended use of sep.
>>> print(*["hello", "world"], sep=" cruel ")
hello cruel world

>>> print(*range(5), sep="---")
0---1---2---3---4

Using join as an alternative
The alternative approach for joining an iterable into a string with a given separator is to use the join method of a separator string.
>>>print(" cruel ".join(["hello", "world"]))
hello cruel world

This is slightly clumsier because it requires non-string elements to be explicitly converted to strings.
>>>print(",".join([str(i) for i in range(5)]))
0,1,2,3,4

Brute force - non-pythonic
The approach you suggest is one where a loop is used to concatenate a string adding commas along the way. Of course this produces the correct result but its much harder work.
>>>iterable = range(5)
>>>result = ""
>>>for item, i in enumerate(iterable):
>>>    result = result + str(item)
>>>    if i > len(iterable) - 1:
>>>        result = result + ","
>>>print(result)
0,1,2,3,4

A:

You can use str.join() and create the string you want to print and then print it. Example -
print(','.join([str(x) for x in range(5)]))

Demo -
>>> print(','.join([str(x) for x in range(5)]))
0,1,2,3,4

I am using list comprehension above, as that is faster than generator expression , when used with str.join .

