CODEWITHSUNDEEP
python
user16714199
user16714199

Reputation: 228

python iterate from 0 to any Integer, positive or negative

I have to iterate from 0 to any Integer (call it x) that can be positive or negative (0 and x both included) (whether I iterate from x to 0 or from 0 to x does not matter) I know I can use an if-else statement to first check if x is positive or negative and then use range(x+1) if x>0 or range(x, 1) if x<0 (both will work when x=0) like:

if x >= 0:
    for i in range(x+1):
        pass
else:
    for i in range(x, 1):
        pass

but I want a better way especially since I will actually be iterating over 2 Integers and this code is messy (and here also whether I iterate from y to 0 or from 0 to y does not matter)

if (x >= 0) and (y >= 0):
    for i in range(x+1):
        for j in range(y+1):
            pass
elif (x >= 0) and (y < 0):
    for i in range(x+1):
        for j in range(y, 1):
            pass
elif (x < 0) and (y >= 0):
    for i in range(x, 1):
        for j in range(y+1):
            pass
else:
    for i in range(x, 1):
        for j in range(y, 1):
            pass

Upvotes: 0

Views: 907

Answers (3)

Anton Borkivskyi
Anton Borkivskyi

Reputation: 66

A simple solution that requires no functions

for i in range(min(x, 0), max(x, 0) + 1):
    for j in range(min(y, 0), max(y, 0) + 1):
        pass

Upvotes: 1

ILS
ILS

Reputation: 1380

You can simplify it by defining a function.

get_range_args = lambda x: (0, x+1) if x > 0 else (x, 1)
for i in range(*get_range_args(x)):
    for j in range(*get_range_args(y)):
        pass

Upvotes: 1

The Myth
The Myth

Reputation: 1218

Approach 1:

x = -9
y = 1
def getPosNeg(num):
    if num >= 0:
         return f"0, {num+1}"
    return f"{num}, 1"
x_eval = eval(getPosNeg(x)) # use eval
y_eval = eval(getPosNeg(y)) # use eval
for i in range(*x_eval):
    for j in range(*y_eval):
        print(i, j)

Approach 2:

x = -9
y = 1

def getPosNeg(num):
    if num >= 0:
         return (0, num+1)
    return (num, 1)
x_eval = getPosNeg(x)
y_eval = getPosNeg(y)
for i in range(*x_eval):
    for j in range(*y_eval):
        print(i, j)

If you only want positive integers in range, use abs():

x = -9
y = 1

for i in range(abs(x+1)):
    for j in range(abs(y+1)):
        print(i, j)

Docs:
eval()

Upvotes: 0

Related Questions