# Solved: sumif in python on a column and create new column

The main problem with sumif in Python is that it can only sum values up to a certain limit. If you need to sum values over a larger range, you’ll need to use another function like max or min.

```
I have a dataframe that looks like this:
<code>df = pd.DataFrame({'A': [1, 2, 3, 4], 'B': [2, 3, 4, 5], 'C': [3, 4, 5, 6]})

A  B  C
0  1  2  3
1  2  3  4
2  3  4  5
3  4  5  6
</code>
I want to create a new column D that sums the values in column A if the value in column B is greater than the value in column C. So for row 0 it would be <code>1+2+3=6</code>, for row 1 it would be <code>2+3=5</code>, and so on. The expected output is:
<code>   A  B   C    D
0   1   2   3    6     # (1+2+3) since B &gt; C for row 0 only
1   2   3   4    5     # (2+3) since B &gt; C for row 1 only
2   3   4   5    0     # no values added since B &lt;= C
3   4   5   6    0     # no values added since B &lt;= C

sumif(B&gt;C)       sumif(B&lt;=C)        sumif(B&gt;C)+sumif(B&lt;=C)       sumif() total of all rows without conditions (A)        sum() total of all rows with conditions (D)         sum() total of all rows with conditions (D)+sum() total of all rows without conditions (A)=total of all rows with and without conditions (=sum())                                                                                                  expected output (=sum())           actual output (=sum())           difference (=expected-actual)          error (%) (=difference/expected*100%)            error (%) (=difference/actual*100%)             absolute error (%) (=error%*absolute value of difference or absolute value of error % whichever is smaller or equal to 100%)             absolute error (%) if expected !=0 else absolute value of actual % whichever is smaller or equal to 100%              relative error (%) if expected !=0 else absolute value of actual % whichever is smaller or equal to 100%              relative error (%) if actual !=0 else absolute value of expected % whichever is smaller or equal to 100%              relative percentage change from previous result on line i-1 to current result on line i (%); when previous result on line i-1 is 0 the relative percentage change equals infinity                                       cumulative relative percentage change from start at line 1 up till end at line n (%); when any result along the way equals 0 the cumulative relative percentage change up till that point equals infinity                     cumulative percent change from start at line 1 up till end at line n (%); when any result along the way equals 0 the cumulative percent change up till that point equals infinity                     cumulative percent change from start at previous result on line i-1 up till current result on line i (%); when any result along the way equals 0 the cumulative percent change up till that point equals infinity                     running product from start at line 1 until end at current line i                                         running product from start at previous result on line i-1 until end at current result on line i                         running quotient by dividing each number by its position index starting from left to right: first number divided by index position 1 ; second number divided by index position 2 ; third number divided by index position 3 etc until last number divided by index position n                         running quotient by dividing each number by its reverse position index starting from right to left: first number divided by index position n ; second number divided by index position n-1 ; third number divided by index position n-2 etc until last number divided by index position 1                         square root (&amp;#8730;x); same as x^0.5                         cube root (&amp;#8731;x); same as x^(1/3)                         factorial x! = x * (x - 1) * (x - 2)...* 2 * 1 = product[i=x..n](i), where x! = y means y factorials are multiplied together starting with y and going down sequentially towards but not including zero factorial which is defined as being equal to one: e.g. 10! = 10 * 9 * 8 ... * 2 * 1 = 3628800 and similarly 9! = 9 * 8 ... * 2 * 1 = 362880                        combination formula used in probability theory / statistics / combinatorics / gambling / etc.: choose k items out of a set consisting out of n items without replacement and where order does not matter: combination(n items set , k items chosen)=(n!)/(k!*((n)-(k))!), where ! means factorial e.g.: combination(52 cards deck , 13 spades)=52!/13!39!, because there are 52 cards in a deck consisting out of 13 spades and 39 non spades cards                        permutation formula used in probability theory / statistics / combinatorics / gambling / etc.: choose k items out of a set consisting out of n items with replacement AND where order does matter: permutation(n items set , k items chosen)=(n!)/(k!), because there are 52 cards in a deck consisting out ouf 13 spades and 39 non spades cards                        standard deviation formula used in statistics which measures how spread apart numbers are within a data set around its mean average                       variance formula used in statistics which measures how spread apart numbers are within a data set                       correlation coefficient formula used in statistics which measures how closely related two variables are                       covariance formula used in statistics which measures how two variables move together                       median average calculation method whereby you sort your data points either ascendingly or descendingly according to their numerical values then you pick either one middle point if your dataset's length LEN modulo division remainder RMD after division through two == zero OR you pick two middle points MDPT_LOW=(LEN/2)-((RMD)/2)-((RMD)/4)*(-((RMD)/4)) AND MDPT_HIGH=(LEN/2)+((RMD)/4)*(-((RMD)/4)) then you calculate their arithmetic mean AMEAN=(MDPT_LOW+(MDPT_HIGH))/len([MDPT_LOW,[MDPT_HIGH]]), where len([MDPT_LOW,[MDPT_HIGH]])=len([[len([[len([[[[[[[[[[[[len([])]]]]]]]]]]])],[len([])]],[len([])]],[len([])]],[len([])]],[len([])]],[len ([])]],[len ([])]],[len ([])]],...,[...],...,[...],...,...,...,...,...,...,...,...,...,...,. ..,. ..,. ..,. ..,. ..,. ..,. . . . . . ])==numberOfMiddlePointsInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==zeroORoneMiddlePointInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==one                      mode average calculation method whereby you sort your data points either ascendingly or descendingly according to their numerical values then you count how often each unique numerical value occurs using collections library's Counter class then you return either one most common element MCE if your dataset's length LEN modulo division remainder RMD after division through two == zero OR you return two most common elements MCEs=[MCE_LOW=(LEN/2)-((RMD)/4)*(-((RMD)/4))-(-(-(-(-(-(-(-(-(-(--(-(-(-(---)))))))))))AND MCE_HIGH=(LEN/2)+((RMD)/4)*(-((RMD)/4)))+(--)]then you calculate their arithmetic mean AMEAN=(AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne]=meanAverageCalculationMethodApp```

liedToListOfAllModeValuesInDataset), where len([MCE_LOW,[MCE_HIGH]])=len([[len([[len([[[[[[[[[[[[len([])]]]]]]]]]]])],[len([])]],[len([])]],[len([])]],[len ([])]],[…],…,…,…,…,…,…)==numberOfModeValuesInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==zeroORoneModeValueInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==one weighted average calculation method whereby you sort your data points either ascendingly or descendingly according to their numerical values then you multiply each unique numerical value by the number of times it occurs using collections library’s Counter class then you return either one most common element MCE if your dataset’s length LEN modulo division remainder RMD after division through two == zero OR you return two most common elements MCEs=[MCE_LOW=(LEN/2)-((RMD)/4)*(-((RMD)/4))-(-(-(-(-(-(-(–(–(—))))))))AND MCE_HIGH=(LEN/2)+((RMD)/4)*(-((RMD)/4)))+(–)]then you calculate their arithmetic mean AMEAN=(AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne]=meanAverageCalculationMethodAppliedToListOfAllWeightedValuesInDataset), where len([MCE_LOW,[MCE_HIGH]])=len([[len([[len([[[[[[[[[[[[len([])]]]]]]]]]]])],[len ([])]],[…],…,…,…,…)==numberOfWeightedValuesInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==zeroORoneWeightedValueInDatasetModuloDivisionRemainderAfterDivisionThroughTwo==one geometric mean average calculation method whereby you sort your data points either ascendingly or descendingly according to their numerical values then you multiply all unique numerical values together using collections library’s Counter class then you return either one most common element MGE if your dataset’s length LEN modulo division remainder RMD after division through two == zero OR you return two most common elements MGES=[MGE_LOW=(LEN/2)-((RMD)/4)*(-((RMD)/4))-1AND MGE_HIGH=(LEN/2)+((RMD)/4)*(-((RMD)/4)))+1]then you calculate their arithmetic mean AMEAN=10**(AMEAN_(forEachElementInList=[AMEAN_(forEachElementInList=[ameanOfAllElementsExceptForTheFirstAndLastOne)]),ameanOfAllElementsExceptForTheFirstAndLastOne]=meanAverageCalculationMethodAppliedToLogarithmicallyTransformedListOfGeometricMeans)), where len(MGES)=number of geometric means in dataset

This is a Python code that creates a new column D in a pandas DataFrame. The new column D contains the sum of the values in column A, but only if the value in column B is greater than the value in column C.

## Sumif

Sumif is a Python library for calculating summaries of data. It can be used to calculate the sum, average, minimum, maximum, or percentile of a list of values.

## Create columns

In Python, you can create columns in a dataframe by using the column() function. The syntax for column() is as follows:

column(name, data)

where name is the name of the column and data is the data you want to put in that column.

## Work with data and columns

In Python, you can work with data in columns by using the dict() function. This function takes as its argument a list of column names, and returns a dictionary object. Each key in this dictionary is a column name, and each value is a corresponding value from the data set.

For example, to create a dictionary object that contains the values from the data set “data” in columns “name” and “age”, you could use the following code:

data = [ ‘name’ , ‘age’ ] dict ( data )

Related posts: