All Questions
9 questions
24
votes
8
answers
7k
views
Is using lambdas to express intent not pythonic?
PEP 8 states the following about using anonymous functions (lambdas)
Always use a def statement instead of an assignment statement that
binds a lambda expression directly to an identifier:
# Correct: ...
- 351
-1
votes
2
answers
129
views
Architecture for EOD (end of day) stock exchange prices
I need to work out the architecture for a NASDAQ frontend charting application (a desktop app in .Net). Note that this is NOT for real-time quotes.
NASDAQ provides an api that gives historical pricing,...
- 117
62
votes
5
answers
51k
views
Why doesn't Python allow multi-line lambdas?
Can someone explain the concrete reasons why BDFL choose to make Python lambdas single line?
This is good:
lambda x: x**x
This results in an error:
lambda x:
x**x
I understand that making ...
- 9,495
9
votes
3
answers
12k
views
Lambda expressions with no parameters in Haskell and / or lambda calculus
In eager languages like Scheme and Python, you can use a lambda expression without parameters to delay evaluation, e.g. in Scheme (Chicken Scheme):
#;1> (define (make-thunk x) (lambda () (+ x 1)))
...
- 19.8k
1
vote
1
answer
488
views
Using lambdas to simulate python generators in java
I am currently dealing with an app that has several classes which are used to compare files in various formats (xls, csv, xml, html, pdf...). They are all implementing an interface that is defined ...
- 19
2
votes
2
answers
818
views
Unknown number of arguments in currying
Hypothetical situation - can a currying function have an unknown number of arguments (kind of like varargs)
Eg in Python:
addByCurrying(1)(2)(3)(4)
Should equal 10
addByCurrying(5)(6)
Should equal ...
- 353
4
votes
1
answer
2k
views
Is Lambda Still Supported In Python?
Only one or two years ago, I remember reading Python constructs that would be removed from Python -- reduce was one of them -- and other constructs that would be emphasized like comprehensions and ...
- 699
5
votes
1
answer
6k
views
Is python lambda "really formal" λ-calculus or just share the name?
Now and then I use the Python lambda. Is it so formal that it is safe to say that you can do formal lambda calculus with it? I just used it but I didn't fully understand whether the python lambda and ...
- 8,158
0
votes
2
answers
146
views
Iterating a function with a static argument: Global functions + lambdas vs internal function?
I am never sure which of these is better form:
Option A
def a(x,y):
def b(z): return z+y
return map(b, x)
print a([10,20], 5)
Option B
def b(z,y): return z+y
def a(x,y):
return map(...
- 111