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Add doctest for #20847 #34963

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Feb 19, 2023
Merged

Add doctest for #20847 #34963

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7 changes: 7 additions & 0 deletions src/sage/rings/power_series_poly.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -1025,6 +1025,13 @@ cdef class PowerSeries_poly(PowerSeries):
Traceback (most recent call last):
...
ValueError: Series must have valuation one for reversion.

sage: Series = PowerSeriesRing(SR, 'x')
sage: ser = Series([0, pi])
sage: ser
pi*x
sage: ser.reverse()
1/pi*x + O(x^20)
"""
if self.valuation() != 1:
raise ValueError("Series must have valuation one for reversion.")
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