["python","excel","pandas","conditional-statements","aggregate"]
Pandas counting and summing specific conditions

Are there single functions in pandas to perform the equivalents of SUMIF, which sums over a specific condition and COUNTIF, which counts values of specific conditions from Excel? I know that there are many multiple step functions that can be used for For example for sumif I can use (df.map(lambda x: condition) or df.size()) then use .sum(), and for countif, I can use (groupby functions and look for my answer or use a filter and the .count()). Is there simple one step process to do these functions where you enter the condition and the dataframe and you get the sum or counted results?
You can first make a conditional selection, and sum up the results of the selection using the sum function. >> df = pd.DataFrame({'a': [1, 2, 3]}) >> df[df.a > 1].sum() a 5 dtype: int64 Having more than one condition: >> df[(df.a > 1) & (df.a < 3)].sum() a 2 dtype: int64 If you want to do COUNTIF, just replace sum() with count()