CODEWITHSUNDEEP
pythonpython-3.xfor-loop
frankiie
frankiie

Reputation: 498

How to use multiple variables inside the Python for loop?

I'm a Java guy, currently learned Python. I'm stuck on how to use multiple conditions inside the Python for-loop.

here is the Java code

for (int r = n-1, s = k+1; r > s; r--, s++)
    // some code

How can I convert this into Python for-loop?

Upvotes: 4

Views: 114

Answers (2)

Selcuk
Selcuk

Reputation: 59445

This can best be implemented as a while loop. It is more verbose than Java but also more Pythonic and, in my personal opinion, more readable:

r = n - 1
s = k + 1
while r > s:
    # some code
    r -= 1
    s += 1

Update: You can use a for loop but it's not as pretty:

p = (k + n) // 2
for r, s in zip(range(n - 1, p, -1), range(k + 1, p + 1)):
    # some code

Upvotes: 5

pakpe
pakpe

Reputation: 5489

If you insist on doing it with a for loop, you can create a generator:

def gen(n, k):
    r = n - 1
    s = k + 1
    while r > s:
        yield (r, s)
        r -= 1
        s += 1

for x in gen(n, k):
    #some code

#alternatively:
for x, y in gen(n, k):
    #some code

Upvotes: 1

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