Allow .where and .mask to accept callable as cond. This is useful if DataFrame is changed during method chaining.
df = pd.DataFrame(np.random.randn(2, 2))
df.where(lambda x: x > 0)
# currently raises ValueError
Should be the same as:
df.where(df > 0)
# 0 1
#0 0.689202 NaN
#1 NaN 0.261644
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