cumulative sum in python
import pandas as pd
import numpy as np
# Create a dataframe
df1 = pd.DataFrame({"A":[None, 3, 8, 14],
"B":[1, None, 4, 3],
"C":[5, 3, 9,None]})
# Computing sum over Index axis
print(df1.cumsum(axis = 0, skipna = True))
#skipna exclude null valuespandas cumulative sum column
import pandas as pd
from random import randint
df = pd.DataFrame(data=[{'duration': randint(0,3)} for _ in range(5)])
df.head()
# duration
# 0 0
# 1 2
# 2 1
# 3 0
# 4 3
df['cum_dur'] = df.duration.cumsum()
df.head()
# duration cum_dur
# 0 0 0
# 1 2 2
# 2 1 3
# 3 0 3
# 4 3 6Copyright © 2021 Codeinu
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