exaloop
NameError when handling the list comprehension.
The given example shows a list comprehension that creates a new list by applying a specific operation or function to each element of an iterable, i.e., numbers in the range of 0 to 4, inclusive. It defines a loop, i.e., for k in range(5), that iterates over the numbers 0 to 4. ((m := k+1), k * m) creates a tuple containing two elements: the value of m and the product of k and m. The list comprehension will create a list of these tuples for each value of k in the range. The expected resulting list looks like this: [(1, 0), (2, 2), (3, 6), (4, 12), (5, 20)], while Codon throws a NameError.
test.py
a = [((m := k+1), k * m) for k in range(5)]
print(a)
The expected output (CPython 3.10.8):
[(1, 0), (2, 1), (3, 2), (4, 3), (5, 4)]
The actual output on Codon v 0.16.0
NameError: variable 'm' not yet defined
Raised from: __internal__.undef:0
/home/xxm/Desktop/Codon/codon-linux-x86_64/codon-deploy/lib/codon/stdlib/internal/internal.codon:368:13
Aborted (core dumped)
Reproduce step:
download the Pre-built binaries for Linux Type " codon run --release test.py" in the console.
Environment: Ubuntu 18.04 Codon v0.16.0 CPython 3.10.8
@xiaxinmeng Workaround:
m: int # define variable
a = [((m := k + 1), k * m) for k in range(5)]
print(a)
The same code without walrus operator:
a = []
for k in range(5):
m = k + 1
a.append((m, k * m))
print(a)
