How to create a MyRange function like the standard range in Python

Question

I wrote the MyRange function that only has one argument

https://code.sololearn.com/cK29IXNg439W/?ref=app

What I want :

def MyRange(stop):
def MyRange(start, stop[, step]):

Not this :

def My range(**argument):

I appreciate if anyone have any solution!!

Answer 1

In case you don't like tuple unpacking, the following should work. (Also, your code doesn't seem to handle the case of negative steps so well.)

def MyRange(x, y=None, step=1):
if y is None:
start, stop = 0, x
else:
start, stop = x, y

# main code here
while ((step > 0 and start < stop) or
(step < 0 and start > stop)):
yield start
start += step

It can be shortened, of course, by directly using start and stop instead of x and y. But I didn't want the names to be misleading when x is actually stop.

Answer 2

左其右 I think the way I coded it, you can use all the forms.

# only stop
# print integers from 0 to 10
for i in MyRange(11):
print(i)

# start and stop
# print integers from 5 to 10
for i in MyRange(5, 11):
print(i)

# start, stop, and step
# print integers from 2 to 10 in steps of 3
for i in MyRange(2, 11, 3):
print(i)

Answer 3

左其右 that's just telling you what the arguments mean if you give different amount of arguments

in python, functions don't have polymorphism, so it just override the previous one if you define it twice

therefore, if you want to let your function accept different amout of arguments and have different order of meaning, the better method is using func(*args) and decide their usage in the function

another method is using keywords, like this:

def myRange(*noUse, start=0, end=None, step=1):
if len(noUse) is 1:
end = noUse[0]

but it's pretty meaningless🤔

Answer 4

Kishalaya Saha your answer is good.

But how to explain this

https:/goo.gl/7hxDUc

It says that range() constructor has two form.

range(stop)
range(start, stop[, step])

Answer 5

Kishalaya Saha 👍👍👍 yes yours is better😆

Answer 6

左其右 好名好名👏👏👏

Answer 7

Use a default argument for step...
https://code.sololearn.com/cy61cLst0nDN/?ref=app