我需要在不使用numpy和pandas的情况下在csv文件中计算第一和第三四分位数

Question

File looks like 3 columns of integer numbers. This is what I have But it is returning me TypeError: slice indices must be integers or None or have an index method

import statistics

file = open("PokemonF.csv","r")
first_col=[]
sec_col=[]
third_col=[]
columns=[first_col]
for line in file :
    data = line.split(',')
    first_col.append(int(data[0]))
    sec_col.append(int(data[1]))
    third_col.append(int(data[2]))
for col_ in columns:
    min_col = min(first_col)
    sortedData = sorted(first_col)
    mid = len(first_col)/2
    if len(sortedData) % 2 == 0:
        lowerQ = statistics.median(sortedData[:mid])
        upperQ = statistics.median(sortedData[mid:])
    else:  
        lowerQ = statistics.median(sortedData[:mid])
        upperQ = statistics.median(sortedData[mid+1:])
    median_col = statistics.median(first_col)
    max_col = max(first_col)


    print("Minimum: {}".format(min_col))
    print("First quartile: {}".format(lowerQ))
    print("Median: {}".format(median_col))
    print("Maximum: {}".format(max_col))
file.close

Answer 1

I can't test the solution since you failed to provide a Minimal, complete, verifiable example , but I think I see your problem:

mid = len(first_col)/2
if ...
    lowerQ = statistics.median(sortedData[:mid])
    upperQ = statistics.median(sortedData[mid:])

If first_col has an odd quantity of elements, then mid is a float value, such as 7.5. You can't use that as a string slice index. Try integer division instead:

mid = len(first_col) // 2

Depending on your local definition of "quartile" boundary, you may need to add 1.