How to Extract a Single Value from a Dataframe Cell in Python?

Retrieving a Single Value from a Dataframe Cell

Oftentimes, when working with dataframes, the need arises to extract a single value from a specific cell. Consider a scenario where a query returns a single row dataframe:

<code class="python">d2 = df[(df['l_ext']==l_ext) & (df['item']==item) & (df['wn']==wn) & (df['wd']==1)]</code>

To obtain the desired value, a common approach may be to access the desired column:

<code class="python">val = d2['col_name']</code>

However, this would result in a dataframe with a single row and a single column, rather than the expected float value.

To rectify this situation, the following approach can be employed:

1. Retrieve the first (and only) row as a Series using iloc:

<code class="python">row = d2.iloc[0]</code>

2. Extract the value using the column name:

<code class="python">val = row['col_name']</code>

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