﻿ Pandas: Use a local variable within a query - w3resource # Pandas: Use a local variable within a query

## Pandas: DataFrame Exercise-75 with Solution

Write a Pandas program to use a local variable within a query.

Sample Solution :

Python Code :

``````import pandas as pd
df = pd.DataFrame({'W':[68,75,86,80,66],'X':[78,85,96,80,86], 'Y':[84,94,89,83,86],'Z':[86,97,96,72,83]});
print("Original DataFrame")
print(df)
maxx = df["W"].max()
print("\nValues which are less than maximum value of 'W' column")
print(df.query("W < @maxx"))
``````

Sample Output:

```Original DataFrame
W   X   Y   Z
0  68  78  84  86
1  75  85  94  97
2  86  96  89  96
3  80  80  83  72
4  66  86  86  83

Values which are less than maximum value of 'W' column
W   X   Y   Z
0  68  78  84  86
1  75  85  94  97
3  80  80  83  72
4  66  86  86  83
```

Python Code Editor:

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## Python: Tips of the Day

Dictionary comprehension:

```>>> m = {x: x ** 2 for x in range(5)}
>>> m
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
```