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Advanced Techniques in pandas

bookGetting Familiar With lambda Functions

Sometimes we need to put some conditions on the indices. In these cases, you need to use a lambda function inside iloc[].

Let's figure out what we can do using lambda:

data.iloc[lambda x: x.index < 5]

This code will output the first five rows of the dataset, the rows with the indices 0, 1, 2, 3, and 4.

  • lambda x - x is the argument we will work with (the item of the data set);
  • x.index - extracts only values of rows' indices;
  • x.index < 5 - the condition according to which we will extract data. Here, only rows with indices that are less than 5.
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Your task here is to divide data into two groups: one has odd indices and the other even. Follow the algorithm:

  1. Import the pandas library with the pd alias.
  2. Read the csv file.
  3. Extract only rows with even indices:
    • Apply the .iloc[] attribute to the data;
    • Within the .iloc[] attribute, apply the lambda function with the x argument;
    • Set a condition to check if the number is even (if you do not know how to do this, check the hint).
  4. Extract only rows with odd indices:
    • Apply the .iloc[] attribute to the data;
    • Within the .iloc[] attribute, apply the lambda function with the x argument;
    • Set a condition to check if the number is odd (if you do not know how to do this, check the hint).
  5. Output data:
    • Output the first five rows of the even indices;
    • Output the last five rows of the odd indices.

Lösning

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bookGetting Familiar With lambda Functions

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Sometimes we need to put some conditions on the indices. In these cases, you need to use a lambda function inside iloc[].

Let's figure out what we can do using lambda:

data.iloc[lambda x: x.index < 5]

This code will output the first five rows of the dataset, the rows with the indices 0, 1, 2, 3, and 4.

  • lambda x - x is the argument we will work with (the item of the data set);
  • x.index - extracts only values of rows' indices;
  • x.index < 5 - the condition according to which we will extract data. Here, only rows with indices that are less than 5.
Uppgift

Swipe to start coding

Your task here is to divide data into two groups: one has odd indices and the other even. Follow the algorithm:

  1. Import the pandas library with the pd alias.
  2. Read the csv file.
  3. Extract only rows with even indices:
    • Apply the .iloc[] attribute to the data;
    • Within the .iloc[] attribute, apply the lambda function with the x argument;
    • Set a condition to check if the number is even (if you do not know how to do this, check the hint).
  4. Extract only rows with odd indices:
    • Apply the .iloc[] attribute to the data;
    • Within the .iloc[] attribute, apply the lambda function with the x argument;
    • Set a condition to check if the number is odd (if you do not know how to do this, check the hint).
  5. Output data:
    • Output the first five rows of the even indices;
    • Output the last five rows of the odd indices.

Lösning

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Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

close

Awesome!

Completion rate improved to 3.03
Avsnitt 1. Kapitel 5
single

single

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