List Comprehension on Pandas-Series

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#1

Hello everybody!

I’m a bit stuck here… I created a DataFrame from a csv-file, subsetted it and wanted to do a list-comprehension. Everything works fine but the List ends after 99 elements. Does anyhody have an idea?

###Creating List 
df_list = pd.read_csv(file, delimiter=";")
col = 'example'
liste_raw = df_list[col].tolist() #has 112 elements
liste = [i.replace("/","-") for i in liste_raw)] #this list always has 99 elements, no matter how big the input list is

Is there a fundamental mistake in this code? :smiley:

Would be great if anybody could help!

Thank you guys in advance!!!

Cheers
Felix

#2

Are you sure that each row has a “/” or one of those 13 isn’t a null or nan?

Also, is liste a column or a df?
If you want to change each row in a col I think you need to specify the df[col_name] .

https://medium.com/@masonrchildress/how-to-perform-a-list-comprehension-on-your-dataframe-python-8548d3de7bd8

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#3

Hey lisalisaj,

thanks for your response! Yes, I am sure about that.

I just restarted Jupyter Notebook and everything works :smiley:

Thank you again.

Best
Felix

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#4

No, liste is a list generated by list comprehension:

liste = [i.replace("/","-") for i in liste_raw)]

the column is the variable col = 'example'

Cheers

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