Python loop and return pattern-CodePudding

I am trying this code.

Function incre_test is recursive unless it satisfy the condition.

I expect 5 as result but it returns None.

What is the best practice for this pattern?

def incre_test(i):
    if i > 4:
        return i
    i = i   1
    incre_test(i)

res = incre_test(0)
print(res) // why None???

CodePudding user response：

Using a loop inside the function might do you better

such as

def incre_test(i):
    while i < 5:
        i  = 1
    return i

CodePudding user response：

Try this:

def incre_test(i):
    while not i == 5:
        i =1
    return i

res = incre_test(0)
print(res)

You have to use a while <bool>: loop to run a script (in this case i =1) until the condition given is true.

CodePudding user response：

It's because your function is not returning anyting unless the parameter is greater than 4, so all you have to do is to add a return statement over the recursive call of the function, like this...

def incre_test(i):
    if i > 4:
        return i
    return incre_test(i 1)

res = incre_test(0)
print(res)

Output:-