I want to generate a code that will write 20 rows from each of two different dataframes. Therefore, I created something like below. Everything works fine except nested loop (u) starts from 0 each time. Can you help me how to fix it to start from where it left, please? Answer Do you want to alternate between t…
Tag: pandas
interpolation of missing values not NA
I want to interpolate (linear interpolation) data. but not indicated NA. Here is my data. timestamp id strength 1383260400000 10 0.007802251505435157 1383260400000 11 0.0050101566841440105 1383260400000 47 0.09910993935546883 1383260400000 48 0.16302926693340128 and expected data is : timestamp id strength 13…
Pandas dataframe reports no matching string when the string is present
Fairly new to python. This seems to be a really simple question but I can’t find any information about it. I have a list of strings, and for each string I want to check whether it is present in a dataframe (actually in a particular column of the dataframe. Not whether a substring is present, but the who…
Problem: Pandas – Slicing a datetime64[ns] column returns a list of 19-digit integers
I am trying to convert a column of dates in a dataframe to a list, but something is happening when I slice it that turns the dates into 19-digit integers. This is the original df along with the column dtypes: This is the function that turns a dataframe column into a list: This is what is printed after the col…
Using a column of values to create a counter for a variable sequential number column
I currently have a pandas dataframe with some columns. I’m looking to build a column, Sequential, that lists what iteration is recorded at that part of the cycle. I’m currently doing this using itertools.cycle, and a fixed number of iterations block_cycles, like so: With an output like this: And t…
Grouping python dataframe by multiple column name
My goal in to split python dataframe by multiple columns. In the case of one column, data frame can be splitted by column ‘X1’ as below, using the groupby method. However, how to split dataframe according to columns X1 and X2? Answer If pass another column name is necessary select dfs by tuples: I…
Downsample non timeseries pandas dataframe
I have a data frame like below, I want to reduce the size of data frame by Depth_Feet column (let’s say every 2 feet). Desired output is I have tried few options like round and group by etc, but I’m not able to get the result I want. Answer If need each 2 rows per groups: If need resample by
How to return dataframe containing column names of multiple dataframe
I have multiple dataframes and would like a dataframe that contains all column names from said multiple dataframes. For example : I would like to get a dataframe like this : Help would be very appreciated and thank you in advance! Answer If possible extract DataFrame names fom columns names use list comprehen…
How to assign conditional value if I want to use pct_change method on some negative values?
I have a dataframe which contains some negative and positive values I’ve used following code to get pct_change on row values df_gp1 = df_gp1.pct_change(periods=4, axis=1) * 100 and here I want to assign some specific number, depending on how the values change from negative to positive or vice versa for …
How to remove the first n character from all the cells in a column using python pandas?
Please help me to understand the lambda function and how it works in this case. Answer Few things at play here: df[column].apply(f) takes a function f as argument and applies that function to every value in column, returning the new column with modified values. lambda x: x[2:] defines a function that takes a …