Series (pandas)

03 Dec 2023 in Study / Computer science on Pandas

pandas

• One data structure of pandas
• index-value (1 : 1 relationship) → similar to dictionary (key-value)
• Creation
  

import pandas as pd
s = pd.Series(Dictionary)

Index

• There are 2 kinds of index in series
• Integer position index : 0, 1, 2, 3, …
  • pandas.Series(list) → There is no defined index label, so integer index gonna be used automatically
• Index label (user_defined) : key1, key2, key3, …
  • pandas.Series(list or tuple, index=[key1, key2, ….])
• Check index & value
  

import pandas as pd

print(s.index())   # result : RangeIndex(start=n, stop=m, step=a) <m is not included>
print(s.values())  # result : list of values

Access

• Integer Index
  • Series[0] → value0, Series[1] → value1
  • Series[0 : 3] → 0-value0, 1-value1, 2-value2 (series)
  • Series[[0, 3]] → 0-value0, 3-value3 (series)
• Index Label
  • Series[key1] → value1
  • Series[key0 : key3] → key0-value0, key1-value1, key2-value2, key3-value3 (series)
  • Series[[key0, key3]] → key0-value0, key3-value3 (series)