Pythonでcountifをやるときは一回真偽値で出して整数型に変換したあと和を取るのがスマートだと思う。
countif
def f(a):
return sum((条件式).astype(int))
例
def f(a):
return sum((a.values >= 3).astype(int))
a = pd.Series([3, 2, 2, 5, 7])
f(a) #3が出力
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