Thank you Kracekumar.
http://docs.python-guide.org/en/latest/writing/gotchas/#what-you-wrote"Python’s
default arguments are evaluated once when the function is defined,not each time
the function is called." Thank you,
Bhargav.
On Friday, October 3, 2014 9:18 PM, kracekumar ramaraju
<[email protected]> wrote:
On Fri, Oct 3, 2014 at 9:04 PM, Bhargav Kowshik
<[email protected]> wrote:
Nice! Thank you very much Anand.But, I still don't know what is
happening.Please point me to a resource to understand what is happening.
A common beginner mistake. More of such gotcha can be found here
http://docs.python-guide.org/en/latest/writing/gotchas/ .
** Program **
def flat_it(values, result=list()):
for v in values:
if isinstance(v, list):
flat_it(v, result)
else:
result.append(v)
return result
x = [[1, 2, [3, 7]], 4]
print('Input: {0}'.format(x))
print('Output 1: {0}'.format(flat_it(x)))
print('Output 2: {0}'.format(flat_it(x)))
print('Output 3: {0}'.format(flat_it(x, list())))
** Output **
Input: [[1, 2, [3, 7]], 4]
Output 1: [1, 2, 3, 7, 4]
Output 2: [1, 2, 3, 7, 4, 1, 2, 3, 7, 4]
Output 3: [1, 2, 3, 7, 4]
Thank you,
Bhargav.
On Friday, October 3, 2014 8:48 PM, Anand Chitipothu
<[email protected]> wrote:
On Fri, Oct 3, 2014 at 8:26 PM, Bhargav Kowshik
<[email protected]> wrote:
We could use what Anand talked about at Pycon India about handling the headers
in first row of a CSV.In this scenario, instead of default for result being
None and checking if None everytime, we could have the default value an empty
list.
def flat_it(values, result=list()):
for v in values:
if isinstance(v, list):
flat_it(v, result)
else:
result.append(v)
return result
x = [[1, 2, [3, 4, 5, 6, 7]], 4]
print x
print flat_it(x)
Thats a pitfall! Try calling flat_it once again and see what you get.
Anand
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Thanks & Regards
kracekumar"Talk is cheap, show me the code" -- Linus
Torvaldshttp://kracekumar.com
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