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+--- Thread: How to manipulate between lists and get results (/thread-8776.html)
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How to manipulate between lists and get results - pythoneer - Mar-07-2018
I have 2 lists
Number1 = [13,15,79,15,16]
Number2 = [5,6,7,8]
i want to multiply/divide/add the numbers between Number1 and Number2 lists using for loop. How can i do that
RE: How to manipulate between lists and get results - j.crater - Mar-07-2018
What have you tried? Post the code (in Python code tags) and we can assist if you get errors or wrong results.
RE: How to manipulate between lists and get results - pythoneer - Mar-07-2018
i am clueless on how to access the data across two lists
RE: How to manipulate between lists and get results - buran - Mar-07-2018
(Mar-07-2018, 02:09 PM)pythoneer Wrote: i am clueless on how to access the data across two listswell, that is not true, given your previous thread
actually there is enough info in that thread to solve also this problem.
RE: How to manipulate between lists and get results - pythoneer - Mar-07-2018
i am not able to get this right every time and that is why i told i am clueless :(
RE: How to manipulate between lists and get results - nilamo - Mar-07-2018
You have several lists, all of the same size. You want to do something with an element of those lists, all at the same position of the lists. Therefore, use an index.
RE: How to manipulate between lists and get results - pythoneer - Mar-07-2018
Any example code would be helpful :)
RE: How to manipulate between lists and get results - nilamo - Mar-07-2018
>>> spams = [2, 4, 2, 5]
>>> eggs = [6, 4, 3, 2]
>>> for index in range(len(spams)):
... left = spams[index]
... right = eggs[index]
... print("Index: {0} Items: {1}|{2}".format(index, left, right))
...
Index: 0 Items: 2|6
Index: 1 Items: 4|4
Index: 2 Items: 2|3
Index: 3 Items: 5|2
RE: How to manipulate between lists and get results - DeaD_EyE - Mar-07-2018
I think it's good to show the pythonic way.
spams = [2, 4, 2, 5]
eggs = [6, 4, 3, 2]
for spam, egg in zip(spams, eggs):
print(spam, egg)Read this: https://docs.python.org/3/library/functions.html#zipTo get an index, you can use enumerate.
If you have two lists with different sizes and want to have a default value, use itertools.zip_longest(*iterables, fillvalue=None).
zip_longest example:
from itertools import zip_longest
spams = [2, 4, 2, 5, 5, 6, 7, 1, 4, 5, 6]
eggs = [6, 4, 3, 2]
for spam, egg in zip_longest(spams, eggs, fillvalue=1):
# 1 is the neutral element in multiplication or division
# 0 is the neutral element in addition or subtraction
print(f"{spam} * {egg} = {spam * egg}")The f-string f"{spam} * {egg} = {spam * egg}" is new in Python 3.6.It gives us one more method to format strings.
RE: How to manipulate between lists and get results - wavic - Mar-07-2018
Actually, the lists are different sizes.