Why is there an extra space at the beginning of a line?

Question

Python

There is the following simple python code:

x = int(input())
b = ""
for i in range(0, x + 1):
    b += " " + str(i)
print(b)

Question: why did an extra space appear at the beginning of the line, and how to get rid of it without losing spaces in the middle of the line?

Answer 1

Obviously there is no need to add a space in the first iteration. Besides, incrementing a string in a loop is bad practice. Yes, and in general it can be done easier:

x = int(input())
print(' '.join(str(i) for i in range(0, x + 1)))

or even

x = int(input())
print(*range(x+1), sep=' ')