[SOLVED] Key error when working with pandas dataframe

Key error when working with pandas dataframe

I get an error when trying to access a single or multiple elements in a pandas dataframe this way data["temp"]. Here is a code snippet on how I am loading the data:

import pandas

data = pandas.read_csv("weather_data.csv")

y = data["temp"]
print(y)

The csv file -> :

day;temp;condition Monday;12;Sunny Tuesday ;14;Rain Wednesday;15;Rain Tuesday ;14;Cloudy Friday;21;Sunny Saturday;22;Sunny Sunday;24;Sunny

Here is the error I am getting:

line 3790, in get_loc
    return self._engine.get_loc(casted_key)
  File "index.pyx", line 152, in pandas._libs.index.IndexEngine.get_loc
  File "index.pyx", line 181, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\hashtable_class_helper.pxi", line 7080, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas\_libs\hashtable_class_helper.pxi", line 7088, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'temp'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:NAME", line 5, in <module>
    y = data["temp"]
  File "C:\Users\sehab\PycharmProjects\pythonProject\venv\lib\site-packages\pandas\core\frame.py", line 3893, in __getitem__
    indexer = self.columns.get_loc(key)
  File "C:\Users\sehab\PycharmProjects\pythonProject\venv\lib\site-packages\pandas\core\indexes\base.py", line 3797, in get_loc
    raise KeyError(key) from err
KeyError: 'temp'

is the problem with my code or with the package of pandas ?

Solution

You are not parsing your csv correctly since the default separator is "," but you have ";" instead.

Try the following:

data = pandas.read_csv(
    filepath_or_buffer="weather_data.csv",
    sep=";",
    header=0
)