4.1. DataFrame Create

4.1.1. Create from List of Dicts

import pandas as pd

pd.DataFrame([
    {'A': 1.0, 'B': 2.0},
    {'A': 3.0, 'B': 4.0},
])

#      A    B
# 0  1.0  2.0
# 1  3.0  4.0

import pandas as pd

pd.DataFrame([
    {'A': 1.0, 'B': 2.0},
    {'B': 3.0, 'C': 4.0},
])

#      A    B    C
# 0  1.0  2.0  NaN
# 1  NaN  3.0  4.0

import pandas as pd

pd.DataFrame([
    {'firstname': 'Mark', 'lastname': 'Watney'},
    {'firstname': 'Jan', 'lastname': 'Twardowski'},
    {'firstname': 'Ivan', 'lastname': 'Ivanovic'},
    {'firstname': 'Melissa', 'lastname': 'Lewis'},
])

#    firstname    lastname
# 0       Mark      Watney
# 1        Jan  Twardowski
# 2       Ivan    Ivanovic
# 3    Melissa       Lewis

4.1.2. Create from Dict

import pandas as pd

pd.DataFrame({
    'A': ['a', 'b', 'c'],
    'B': [1.0, 2.0, 3.0],
    'C': [1, 2, 3],
})

#    A    B  C
# 0  a  1.0  1
# 1  b  2.0  2
# 2  c  3.0  3

import pandas as pd

pd.DataFrame({
    'firstname': ['Mark', 'Jan', 'Ivan', 'Melissa'],
    'lastname': ['Watney', 'Twardowski', 'Ivanovic', 'Lewis'],
})

#    firstname    lastname
# 0       Mark      Watney
# 1        Jan  Twardowski
# 2       Ivan    Ivanovic
# 3    Melissa       Lewis

import pandas as pd
import numpy as np

pd.DataFrame({
    'A': 1.,
    'B': pd.Timestamp('1961-04-12'),
    'C': pd.Series(1, index=list(range(4)), dtype='float32'),
    'D': np.array([3] * 4, dtype='int32'),
    'E': pd.Categorical(["test", "train", "test", "train"]),
    'F': 'foo',
    'G': [1,2,3,4],
})

#      A           B    C  D      E    F  G
# 0  1.0  1961-04-12  1.0  3   test  foo  1
# 1  1.0  1961-04-12  1.0  3  train  foo  2
# 2  1.0  1961-04-12  1.0  3   test  foo  3
# 3  1.0  1961-04-12  1.0  3  train  foo  4

4.1.3. Create from NDArray

import pandas as pd
import numpy as np
np.random.seed(0)

df = pd.DataFrame(np.random.randn(7, 4))

df
#           0         1         2         3
# 0  1.764052  0.400157  0.978738  2.240893
# 1  1.867558 -0.977278  0.950088 -0.151357
# 2 -0.103219  0.410599  0.144044  1.454274
# 3  0.761038  0.121675  0.443863  0.333674
# 4  1.494079 -0.205158  0.313068 -0.854096
# 5 -2.552990  0.653619  0.864436 -0.742165
# 6  2.269755 -1.454366  0.045759 -0.187184

4.1.4. Assignments

4.1.4.1. DataFrame Create

• Assignment: DataFrame Create

• Last update: 2020-10-01

• Complexity level: easy

• Lines of code to write: 10 lines

• Estimated time of completion: 5 min

• Filename: solution/df_create.py

English:

1. Use data from "Given" section (see below)

2. Create DataFrame for input data

Polish:

1. Użyj danych z sekcji "Given" (patrz poniżej)

2. Stwórz DataFrame dla danych wejściowych

Given:

Crew	Role	Astronaut
Prime	CDR	Neil Armstrong
Prime	LMP	Buzz Aldrin
Prime	CMP	Michael Collins
Backup	CDR	James Lovell
Backup	LMP	William Anders
Backup	CMP	Fred Haise

Hints:

• Use selection with alt key in your IDE

• If it's not working use CSV:

  "Crew", "Role", "Astronaut"
  "Prime", "CDR", "Neil Armstrong"
  "Prime", "LMP", "Buzz Aldrin"
  "Prime", "CMP", "Michael Collins"
  "Backup", "CDR", "James Lovell"
  "Backup", "LMP", "William Anders"
  "Backup", "CMP", "Fred Haise"