如何使用rangeindex [pandas]对数据框进行排序

Question

Just started to learn python for data processing. Sorry if this is too basic, but I really couldn't find a solution. I created a DataFrame from a list of tuples:

A=[(0, 1, 0.0),
   (88, 2, 8.3),
   (89, 2, 5.5),
   (96, 2, 7)]
df = pd.DataFrame(A)

Now I got a dataframe with RangeIndex. How could I sort the data by one column? I found a lot of tutorial and examples, eg, df.sort_values(by=['col']) , this works with named indexes or columns. But since the df doesn't have a name, how do I specify it in the sort_values method? Or how do I sort the dataframe by the third column?

Answer 1

I did exactly as you did, and sort_values worked fine for me. In fact, I didn't have a RangeIndex; just a normal pandas dataframe. Here's my code:

import pandas as pd
x = [(6,5,4), (3,2,1)]
df = pd.DataFrame(x)
print(df) # View the unsorted dataframe
df.sort_values(by=0) # Sorts by the 0th column
print(df) # View the sorted dataframe

Even though my columns aren't named, they are still indexed, so I can refer to them by their number when sorting.