Category "pandas"

How to count number of events in a dataframe before and after a given date?

I'm trying to identify individuals who have events before or after events of their first occurrence of an event of a specific type. For example, I'm interested

How to plot data in panda dateframe to histogram?

I have a dataset containing various fields of users, like dates, like count etc. I am trying to plot a histogram which shows like count with respect to date, ho

Pandas DataFrame : How to groupby and sort "by blocks"?

I'm working with a DataFrame containing data as follows, and group the data two different ways. >>> d = { "A": [100]*7 + [200]*7, "B": ["one"

to_string(index = False) results in non empty string even when dataframe is empty

I am doing the following in my python script and I want to hide the index column when I print the dataframe. So I used .to_string(index = False) and then use le

How to assert that sum of two series is equal to sum of another two series

Let's say I have 4 series objects: ser1=pd.Series(data={'a':1,'b':2,'c':NaN, 'd':5, 'e':50}) ser2=pd.Series(data={'a':4,'b':NaN,'c':NaN, 'd':10, 'e':100}) ser3=

slicing with .loc in pandas

I was reading the book - "Python for Data Analysis" and doing code side-by-side on Jupiter notebook. Here is my DataFrame named data : one t

How to join all columns in dataframe? [duplicate]

I would like one column to have all the other columns in the data frame combined. here is what the dataframe looks like 0 1 2 0 123 321

Append column of arrays in Pandas

I have a dataframe of arrays such as: | A | B | C | |:---- |:------:| -----:| | [0,1,2,3] | [1,2,5,6] | [0,1,4,5] | | [0,0,6,3] | [0,2,0,4] | [3,8,7,1]

Pandas: Creating multiple indicator columns after condition with dates

So I have a data set with about 70,000 data points, and I'm trying to test out some code on a sample data set to make sure it will work on the large one. The sa

Left join pandas if column value is within a certain range?

I was wondering if it were possible to merge two datasets if the values were in a certain range of each other. For example, If I want to join on zip codes, then

How do I write a DataProcessing function that has an attribute to obtain the pandas dataframe index and column?

I defined a DataProcessing class before loading my data in load_data. I want to concatenate the meth27 and meth450 dataframes to form the meth dataframe. Finall

Pandas - combine series with unique values, matching across rows

I'll start by dropping in my code and then explain what I'm trying to accomplish: names = [ 'ABX-B767-200BDSF (767-3A)', 'ABX-B767-200BDSF (DAR 767-3A)'

What does "100 *" mean in "100 * df. isna().mean()"?

Can anyone explain what is the use of 100 * in the following line of code: 100 * df.isna().mean() Is it intended to get the percentage of the average value?

Is it more profitable to read files too large line by line or read all files in one step with pandas Dataframe, maybe?

I have run my script in an instance of 18Gb of ram, 4 CPU, and 20 Gb of a disk in both use cases My use case is (read line by line): Read line by line and proce

remove outliers from df based on one column

My df has a price column that looks like 0 2125.000000 1 14469.483703 2 14101.832820 3 20287.619019 4 14469.483703

How to solve the problem with installing google colab?

Tried to solve a simple problem from google.colab import files import numpy as np file = files.upload() !ls my_array = np.loadtxt('train_vector.csv', delimi

Calculating a difference for groups within dataframe

I have a dataframe structured like the example, df, below. This contains 2 variables, time and state. Since these are repeated observations for identity, I want

Add a column based on a condition that iterates over a list

So I have the following dataframe: Person_x Person_y Apple_x Banana_x Orange_x Apple_y Banana_y Orange_y Tomas Sidd

How to exclude future dates from excel data file using pandas?

I'm trying to limit my dataset to dates before today. Below creates a graph but the mask doesn't have any impact. Any help appreciated. df = pd.read_excel("./da

Why memory usage increases when reopening a Parquet file with pandas?

I generated a Pandas dataframe of 8.481.288 rows and 451 columns, where most of the columns have integer values. When I generate this dataframe, the total memor