Percentage change between the current and the prior element. 1

Percentage change between the current and the prior element.

s = pd.Series([90, 91, 85])
s
0    90
1    91
2    85
dtype: int64

s.pct_change()
0         NaN
1    0.011111
2   -0.065934
dtype: float64

Here is what the above code is Doing:
1. Create a Series object with three values.
2. Call the pct_change() method on the Series object.
3. The pct_change() method returns a new Series object with the percent change between each value.

The first value in the Series is NaN because there is no previous value to calculate a percent change from.

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