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Python assigning multiple variables to same list value? - python
I'm writing a function to calculate calendar dates. While cutting down on lines, I've found that I am unable to assign multiple variables to the same range. Jan, Mar, May, Jul, Aug, Oct, Dec = range(1,32) Would there be an efficient way to assign these values and why does python give a ValueError?
Use jan = mar = may = ... = range(1, 32), the easiest way to do what you described would be to use the x=y=z ... = value syntax, where x, y, z, and any other variables you include will all be assigned the value of value. in your example, all the comma-separated variables on the left side of the equals sign are assigned to sequential values of a tuple on the right side. hence, you could do something like this: values = ( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31) jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec = values in your code, you have 7 values on the left, and 31 on the right, so you get an out of range error because the list on the left is longer than the number or variables on the left side to be assigned the values in it. i know the code above doesn't have much relevance to achieving your goal, but i thought i'd at least give some insight as to what it was trying to do. :d, python dictionary sort keys by a value with timestamp, normalizing timestamps in different formats to a common format, need to grab a 3x3 neighbourhood of an input cell from a 2d numpy array, python lambda if statements, python - for cycle in a list of lists [duplicate].
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Python assigning multiple variables to the same list value?.
I'm writing a function to calculate calendar dates. While cutting down on lines, I've found that I am unable to assign multiple variables to the same range .
Would there be an efficient way to assign these values and why does python give a ValueError?
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python - read from file and assign into multiple lists
How do I make the code so it reads the file and splits it so that it can assign which lines I specify into a certain named list. I want the first 3 lines to be assigned into a list then the next 3 and so on, so it would be:
list1 = Steve, Cat, v, 2, 3, 4, 1, 28
list2 = John, Dog, h , 6, 1, 7, 2, 45
list3 = (something)
text file below named character:
main code below
Thanks for the help I'm new to python
- Is it always three lines? like first line is first name, 2nd line is last name, and 3rd line is attributes something like that? – VLDCNDN May 28, 2022 at 7:41
- yeah it's always 3 lines – Infusion May 28, 2022 at 7:45
- 1 Try to use with open("character.txt", 'r') as character_file: instead of open() and then close . It will close the file even if there's an exception. – Ignatius Reilly May 28, 2022 at 7:53
As mentioned in the comments, using a with block will close the file automatically once it goes out of scope.
This solution grabs your lines in blocks of 3. It then places the lists into a dictionary with the name as the key. It's not practical to put the lists into variables with the names as you have done.
As S3DEV has kindly mentioned in the comments, this is not very effective for large files and the file object itself can be iterated rather than reading in the entire file with readlines() . I've taken a shortcut and assumed that your file will always have 3 lines for each grouping and that your file will not end in the middle of an entry.
(note: walrus operator := requires Python 3.8 or above)
- 2 If reading a large file, the answer could be made more efficient by using a counter, rather than reading the entire file into memory. f can be iterated directly, thus removing the need to read the entire file into memory. – S3DEV May 28, 2022 at 9:22
- I wonder where readlines is still taught. In my opinion it should have been deprecated and thrown away when Python 3 was developed. – Matthias May 28, 2022 at 11:52
- I don't do much in the way of reading raw files anymore (csvs with Pandas and binary into NumPy, spoiled I know!). I'm assuming you mean using readline from f directly, but if I turn f into an iterator, there's no inherent way to just grab 3 off the top short of inslice that I found. – jonsca May 28, 2022 at 21:19
- @S3DEV Is that edit more in line with what you had in mind? (doing this more for my own edification at this point) – jonsca May 30, 2022 at 8:54
- 1 @jonsca - Even more simple actually. Something along the lines of the first solution in this answer . – S3DEV May 30, 2022 at 13:56
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Python List Comprehension: assign to multiple variables
Is there a way to assign to multiple variables in a one-liner?
Let's say I have a list of 3D points and I want x, y and z lists.
I am thinking of something like:
You can use zip() function:
Or if you want lists instead of tuples:
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I am trying to return a list of indices for elements within another list that pass some sort of rule (as fast as possible). I am interested in the Elementspassed matrix just to be a list of indices in which
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Being familiar with the MATLAB programming language I'm looking for a convenient way to achieve the following assignment in python. A copy of the original list would also be fine
Because of pitfalls like this, code which modifies data in place can be more difficult to understand. However, it is often far more efficient to modify a large data structure in place than to create a modified copy for every small change
Being familiar with the MATLAB programming language I'm looking for a convenient way to achieve the following assignment in python
While cutting down on lines, I've found that I am unable to assign multiple variables to the same range. Jan, Mar, May, Jul, Aug, Oct, Dec = range(1,32) Would there be an efficient way to assign these values and why does python give a ValueError?
While cutting down on lines, I've found that I am unable to assign multiple variables to the same range. Python assigning multiple variables to the same list value?advertisements
How do I make the code so it reads the file and splits it so that it can assign which lines I specify into a certain named list
Is there a way to assign to multiple variables in a one-liner? Let's say I have a list of 3D points and I want x, y and z lists