TCL like for loop in python

Question

I am looking for loop similar to other languages PERL/TCL/C++ in python.

Like in TCL below is the for loop

for { set i 0 } { $i < $n } { incr i} {

#I like to increment i value manually too like
if certain condition is true then increment
set i = [expr i+1] # in some cases
print i

I there similar way in python too. In python i know below is the for loop syntax

for i in var1
#How to increment var1 index manually in some scenarios

@DaleWilson: It will increment by one each time. But if we want to increment based on conditions like some scenarios increment by 2 — Sumit
– Sumit, Commented Jul 17, 2017 at 16:29
Possible duplicate of How do I use a C-style for loop in Python? — Aurora0001
– Aurora0001, Commented Jul 17, 2017 at 16:31

VIX · Accepted Answer · 2017-07-17 16:30:07Z

2

Use:

for i in range(0, n):
 # Do something

Also, you could use:

i = 0
while i<n:
 # Do something
 i+=1

edited Jul 17, 2017 at 16:30

answered Jul 17, 2017 at 16:25

VIX

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4 Comments

Sumit Over a year ago

If we want to skip some iterations manually inside for loop can we do that

VIX Over a year ago

Yes, but you will have the next number.

VIX Over a year ago

Put if-statement where you need.

Dale Wilson Over a year ago

The theme here is "Use the right tool for the job!" If the increment is uniform, use a for If it needs to be customized, use a while

Lgiro · Accepted Answer · 2017-07-17 16:27:26Z

1

Python's range function, called like range(b, e, i) will yield integers starting with b and ending at e, incrementing by i each time.

answered Jul 17, 2017 at 16:27

Lgiro

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3 Comments

Sumit Over a year ago

How to increment in if some conditions are true

Lgiro Over a year ago

Add an if block for each iteration. If the condition doesn't evaluate to True, you can use continue to move to the next iteration.

Lgiro Over a year ago

It sounds like, if you also want to be able to manually increment i, use a while loop

Barmar · Accepted Answer · 2017-07-17 16:32:04Z

1

Python doesn't have that style of for loop, so use a while loop.

i = 0
while i < n:
    # ...
    if some_condition: # Extra increment
        i += 1
    i += 1 # normal increment

answered Jul 17, 2017 at 16:32

Barmar

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1 Comment

Sumit Over a year ago

Yes while loop I am aware of. I thought there is something in the for loop that I am missing. Thanks for clarification

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