Another question about pythonic syntax, yea!
Suppose we have the following code.
x=[1,2,3,4,5,6,7,8,9,3,3,4,5,4,3]
x=[item for item in x if item!=3]Simple enough, right? We are removing an element from the list if it is equal to 3. However, this code will produce a traceback:
x=[1,2,3,4,5,6,7,8,9,3,3,4,5,4,3]
x=[a for item in x if item!=3]Running this will yield the following bit:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 1, in <listcomp>
NameError: name 'a' is not definedThe same will happen if I run the code that looks like this:
x=[1,2,3,4,5,6,7,8,9,3,3,4,5,4,3]
x=[a for item in x if a!=3]The code will only work if I keep the same naming throughout the line, that is, [item for item in x if item!=3].
So, why? Why does the code throw a traceback when trying to do the 2 situations listed after the working solution? What is happening under the hood after I type in the first 2 lines of code? Are there any more similar situations in which the same constant rule would apply?
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