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Pandas: Append data to an empty DataFrame

Pandas: DataFrame Exercise-49 with Solution

Write a Pandas program to append data to an empty DataFrame.

Sample data:
Original DataFrame:
After appending some data:
col1 col2
0 0 0
1 1 1
2 2 2

Sample Solution :-

Python Code :

import pandas as pd
import numpy as np
df = pd.DataFrame()
data = pd.DataFrame({"col1": range(3),"col2": range(3)})
print("After appending some data:")
df = df.append(data)
print(df)

Sample Output:

After appending some data:
   col1  col2
0     0     0
1     1     1
2     2     2

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]