I am trying to figure out how to sort a list based on a certain part of each string. How do I write the key?
myKey(e)
return e[-5,-2]
print(sorted(["A: (" + str(round(7.24856, 2)) + ")", "B: (" + str(round(5.8333, 2)) + ")"], key = myKey))
I want the output to look like this: ['B: (5.83)', 'A: (7.25)']
In my full code, there are more than two strings in the list, so I cannot just sort them reversed alphabetically.
Thank you
Your syntax for function myKey is wrong. Other than that, you have to slice out the number in the string with the correct index (from index of char '(' + 1 to the character before the last) and convert them to floating point number value so that the sorted function can work properly.
def myKey(e):
return float(e[e.index('(')+1:-1])
print(sorted(["A: (" + str(round(7.24856, 2)) + ")", "B: (" + str(round(5.8333, 2)) + ")"], key = myKey))
You can use tuples sorted() to sort your data alongside with some list and string expressions to get the desired output:
input_list = ['A:(100.27)', 'B:(2.36)', 'C:(75.96)', 'D:(55.78)']
tuples_list = [(e.split(':(')[0], float(e.split(':(')[1][:-1])) for e in input_list]
sorted_tuples = sorted(tuples_list, key=lambda x: x[1])
result = [x[0] +':('+ str(x[1]) +')' for x in sorted_tuples]
print(input_list)
print(tuples_list)
print(sorted_tuples)
print(result)
Output:
['A:(100.27)', 'B:(2.36)', 'C:(75.96)', 'D:(55.78)']
[('A', 100.27), ('B', 2.36), ('C', 75.96), ('D', 55.78)]
[('B', 2.36), ('D', 55.78), ('C', 75.96), ('A', 100.27)]
['B:(2.36)', 'D:(55.78)', 'C:(75.96)', 'A:(100.27)']
