How to make last element in python for loop increment one last time

Question

in Python:

ele = 0
for ele in range(0,4):
    print('-')
print(ele)

I realized that this will print 3 instead of 4 in the end, which is different from C-style for loop. is while the option to achieve C-style behavior?

Answer 1

Try else. Statements under else will be executed exactly once after the code gets out of the loop.

for ele in range(0,4):
    print('-')
else:
    ele=ele+1
print(ele)

Output:

-
-
-
-
4

Answer 2

You can add an independent variable to count the loop iterations with enumerate():

N = 4
items = range(0, N)
i = 0
for i, x in enumerate(items, 1):
    print(i, ":", x)
print("number of loop iterations done:", i)

You should make sure to reset the value before the loop, as it is not set to zero, when the loop did not iterate even once.

For reference:

• https://docs.python.org/3/library/functions.html#enumerate

Answer 3

In python the range function works differently, if you want to print something N times try this:

ele = 0
for i in range(N):
    print("-")
print(ele)

Also is not the only approach you could take for printing, you can also:

print("-\n"*(N-1) + "-" + ele)

The range() function works in different ways:

1. range(N) which means a list from 0 to N-1, i.e, a list containing N elements
2. range(A,B) which means a list from integer A to integer B
3. range(A,B,k) which means a list starting from integer A ending before B and with increments k

You can also refer to the official documents: docs.python.org/3/library/functions.html#func-range

Hope this helps :D!

Answer 4

ele = 0
for ele in range(0,4):
    print('-')
print(ele+1)

Answer 5

for ele in range(param1, param2), it means param1 <= ele < param2

if you want to get the value of param2, you might change the value bigger than param2.

Answer 6

A for with a range is roughly equivalent to a for on a list, i.e. your loop could also be written as:

for ele in [0, 1, 2, 3]:
    print('-')

If you want ele to be equal to the number of loops after executing the for instruction, you could also write:

for ele in [1, 2, 3, 4]:
    print('-')

which can be rewritten using range as:

for ele in range(1, 5):
    print('-')

since range goes from the first parameter to the number immediately before the second parameter.