I have two dataframes like this I now want to populate columns prop1 and prop2 in df2 using the values of df1. For each key, we will have more or equal rows in df1 than in df2 (in the example above: 5 times A vs 3 times A, 2 times B vs 2 times B and 3 times C vs
Tag: pandas
how to make a line trend chart from the given data
I have a histogram which is being generated from one of the dataframe column. But I want to make line similar to histogram. I tried to extract histogram data & plot a line chart but didn’t worked. This code generate a histogram, but I need a line chart which shows the trend Answer This shows the ste…
Exactly Vlookup functionality in Pandas
I have 2 Dataframes. I excel i would add additional columns to Holdings lets say “S&P Number” and perform Vlookup by taking S&P from Holdings and look in Rating Map then return Number value. Holdings = Ratings Map = Please note that we dont have one key in this situation, if i want to cove…
Find timedelta hour with highest number of occurences in pandas dataframe
I have a dataframe where I store orders and the time at which they are received There are may orders but the dataframe contains orders for the month. I want to know which hour I receive the most orders during the month. I tried creating a series like this. So that I could group by hour like this But it
Join multiple columns into one column
Lets say I have pandas data frame like this: What I would like to have is: I tried using apply and join as below but not getting the output as I wish: How can I get output that I want by modifying above code. Thank in advance. Edit: I am looking solution using above code to get the expected output.
Analysing height difference from columns and selecting max difference in Python
I have a .csv file containing x y data from transects (.csv file here). The file can contain a few dozen transects (example only 4). I want to calculate the elevation change from each transect and then select the transect with the highest elevation change. I’ve tried to calculate the change with pandas.…
Stacking a number of columns into one column in python
I have a pandas dataframe of 100 rows x 7 columns like this: Values in column source are connected to the values in the other columns. For example, a is connected to contact_1, contact_2… contact_5. In the same way, b is connected to contact_6, contact_7 …. and contact_10. I want to stack these co…
TypeError: cannot unpack non-iterable int objec
How can I solve this error After running my code as follows . I am using the function below and implementin running window for loop on it but end up getting the error below. The for loop works and hungs at a point. I get this error How can I resolve this error? Answer Just replace return 0 by return
Increment the max rows of the pandas DataFrame
I have this python function to get financial data from some tickers Then So the number of rows of my DataFrame should be around 100k rows. But data.info() is returning: (just 10k rows) How can I increment the max rows of the pandas DataFrame?? Answer 1)Appending the argument paginate=True will extend the limi…
How to get the Toggle flag value and sum of rows between the flag toggle
In continuation to my previous Question I need some more help. The dataframe is like I am trying to have the flag state value along with the toggle count, Means flag toggling state. The output should look like this Can someone help with this? Answer Create helper Series with shift and cumsum and aggregate sum…