﻿ Pandas: Check whether a given column is present in a DataFrame or not - w3resource

# Pandas: Check whether a given column is present in a DataFrame or not

## Pandas: DataFrame Exercise-46 with Solution

Write a Pandas program to check whether a given column is present in a DataFrame or not.

Sample Solution :

Python Code :

``````import pandas as pd
d = {'col1': [1, 2, 3, 4, 7], 'col2': [4, 5, 6, 9, 5], 'col3': [7, 8, 12, 1, 11]}
df = pd.DataFrame(data=d)
print("Original DataFrame")
print(df)
if 'col4' in df.columns:
print("Col4 is present in DataFrame.")
else:
print("Col4 is not present in DataFrame.")
if 'col1' in df.columns:
print("Col1 is present in DataFrame.")
else:
print("Col1 is not present in DataFrame.")
``````

Sample Output:

```Original DataFrame
col1  col2  col3
0     1     4     7
1     2     5     8
2     3     6    12
3     4     9     1
4     7     5    11
Col4 is not present in DataFrame.
Col1 is present in DataFrame.
```

Python-Pandas Code Editor:

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## Python: Tips of the Day

Inserting if statements using conditional list comprehensions:

```x = [1, 2, 3, 4, 5, 6]
result = []
for idx in range(len(x)):
if x[idx] % 2 == 0:
result.append(x[idx] * 2)
else:
result.append(x[idx])
result
```

Output:

```[1, 4, 3, 8, 5, 12]
```
`[(element * 2 if element % 2 == 0 else element) for element in x]`

Output:

```[1, 4, 3, 8, 5, 12]
```
`[element * 2 for element in x if element % 2 == 0]`

Output:

```[4, 8, 12]
```