All Questions
24 questions
2
votes
1
answer
250
views
Write a retry mechanism in Python using functions as arguments
I'd like to write a retry mechanism in Python for unstable network communication.
My service has multiple types of methods:
method1()
method2(arg1)
method3(arg1, arg2)
I'd like to pass the method ...
- 15.3k
1
vote
2
answers
361
views
Python 2: how to pass arguments in tuple to a function? [duplicate]
I would like to pass a tuple of arguments args (at what the tuple varies in length due to some other functions) to a function, which works
def myf(x1,x2,x3,....)
return something involving x1,x2.....
2
votes
1
answer
2k
views
How to bind partial function as method on Python class instances
I want to bind this function as a method on some class:
def foo_method(msg, self):
print self.prefix + msg
This works:
class A(object):
prefix = 'msg: '
A.foo = lambda *args: foo_method('...
- 883
5
votes
2
answers
2k
views
resolving map function issue in python 3 vs python 2 [duplicate]
I'm interested in functional programming with python and am working through Mary Rose Cook's blog post A practical introduction to functional programming.
Apparently, it was written in python 2 as ...
- 3,579
0
votes
2
answers
69
views
How to handle a huge collection of functions in Python 2.7
So I am working on this existing code base which has about 150 or so functions as time series
I wanted to store them in a class in order to prevent namespace pollution.
This is what exists
import ...
- 491
1
vote
3
answers
136
views
While recursing in functional programming (or otherwise), what are the benefits/limitations of working with an explicit state variable?
I was playing around with functional programming in Python, and realized there are two ways to replace loops with recursion. The canonical recursion technique does not seem to need any state, e.g., "...
- 957
4
votes
2
answers
745
views
Filtering function for an arbitrary nested list
I can't find out how to write this function as a lambda because of the double conditional:
def f(e):
if not isinstance(e,list):
if e >10:
return e
else:
return ...
- 29.5k
0
votes
2
answers
2k
views
Merge two lists python [duplicate]
a = [0, 2, 4]
b = list(map(lambda x: x+1, a))
merged list c = [0, 1, 2, 3, 4, 5]
c = [a[0], b[0], a[1], b[1] ... ]
Can I achieve the result with functional programming ?
Instead of just looping ?
...
- 14.9k
2
votes
1
answer
3k
views
Python map on a group
There is an array of strings in this format:
r = [["Name - Version - Author - Message"],[..],..]
I run the following code on this data structure:
from itertools import groupby
m = map(lambda x: x....
- 4,170
1
vote
2
answers
41
views
Possible to pass a function into a object's method as an argument, which can refer to that object?
def my_func():
stuff
return something
my_object.my_method(my_func)
I want my_func to be able to refer to my_object. Essentially like deferred self, which means "whatever object I am in, refer ...
- 421
1
vote
2
answers
67
views
How would someone know, when to pass an object as an argument to functions
Let say I have a string
my_str = "Hello World"
func1 = getattr(__builtins__, 'len')
func1
<built-in function len>
func1()
Traceback (most recent call last):
File "<stdin>", line 1, in &...
- 5,059
5
votes
5
answers
21k
views
Understanding nested lambda function behaviour in python
I'm trying to learn pure functional programming. But this code is puzzling me particularly the second line. I do not understand how the value 2 is passed to the variable x. Can somebody explain this ...
- 61.7k
2
votes
1
answer
402
views
Chaining functions with multiple arguments
Is there a way to chain functions with multiple arguments?
For the moment I "chain" my operation in Python like this:
def createDirIfNecessary(directoryName):
if not os.path.exists(directoryName)...
- 31.2k
-3
votes
3
answers
216
views
Expected output is not achieved here. How to fix that 9 is not a prime number? [duplicate]
Write a function that accepts a positive integer n as function parameter and returns True if n is a prime number, False otherwise. Note that zero and one are not prime numbers and two is the only ...
- 1,027
1
vote
6
answers
13k
views
How to add odd numbers from a list in python?
Write a function that accepts a list of integers as parameter. Your function should return the sum of all the odd numbers in the list. If there are no odd numbers in the list, your function should ...
- 1,027