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Pandas: Append a list of dictioneries or series to a existing DataFrame

Pandas Joining and merging DataFrame: Exercise-4 with Solution

Write a Pandas program to append a list of dictioneries or series to a existing DataFrame and display the combined data.

Test Data:

  student_id              name  marks
0         S1  Danniella Fenton    200
1         S2      Ryder Storey    210
2         S3      Bryce Jensen    190
3         S4         Ed Bernal    222
4         S5       Kwame Morin    199

Dictionary:
student_id                  S6
name          Scarlette Fisher
marks                      205
dtype: object

Sample Solution:

Python Code :

import pandas as pd
student_data1  = pd.DataFrame({
        'student_id': ['S1', 'S2', 'S3', 'S4', 'S5'],
         'name': ['Danniella Fenton', 'Ryder Storey', 'Bryce Jensen', 'Ed Bernal', 'Kwame Morin'], 
        'marks': [200, 210, 190, 222, 199]})

s6 = pd.Series(['S6', 'Scarlette Fisher', 205], index=['student_id', 'name', 'marks'])


dicts = [{'student_id': 'S6', 'name': 'Scarlette Fisher', 'marks': 203},
         {'student_id': 'S7', 'name': 'Bryce Jensen', 'marks': 207}]

print("Original DataFrames:")
print(student_data1)
print("\nDictionary:")
print(s6)
combined_data =  student_data1.append(dicts, ignore_index=True, sort=False)
print("\nCombined Data:")
print(combined_data)

Sample Output:

Original DataFrames:
  student_id              name  marks
0         S1  Danniella Fenton    200
1         S2      Ryder Storey    210
2         S3      Bryce Jensen    190
3         S4         Ed Bernal    222
4         S5       Kwame Morin    199

Dictionary:
student_id                  S6
name          Scarlette Fisher
marks                      205
dtype: object

Combined Data:
  student_id              name  marks
0         S1  Danniella Fenton    200
1         S2      Ryder Storey    210
2         S3      Bryce Jensen    190
3         S4         Ed Bernal    222
4         S5       Kwame Morin    199
5         S6  Scarlette Fisher    203
6         S7      Bryce Jensen    207

Python Code Editor:


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Previous: Write a Pandas program to append rows to an existing DataFrame and display the combined data.
Next: Write a Pandas program to join the two given dataframes along rows and merge with another dataframe along the common column id.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m