Ignore Nulls in pandas map dictionary

Ignore Nulls in pandas map dictionary

By : user3099912
Date : January 11 2021, 05:14 PM
this one helps. Try using the below code, I first use the apply function, than I drop the NaNs, then I convert it into a list then I use the list.index method for each value in the new list, and list.index gives the index of the first occurence of the value, after that convert it into the Series, and make the index the index of the series without NaNs, I am doing that since after I drop the NaNs it will turn from index 0, 1, 2, 3 to 0, 2, 3 or something like that, whereas the missing index will be NaN again, after that I add a underscore to each column, and I join it with the original dataframe:
code :
print(df.join(df.apply(lambda x: pd.Series(map(x.dropna().tolist().index, x.dropna()), index=x.dropna().index)).add_suffix('_')))
  COL1 COL2 COL3  COL1_  COL2_  COL3_
0    A    M    X    0.0    0.0      0
1    B    F    Y    1.0    1.0      1
2  NaN    M    Y    NaN    0.0      1
3    A  NaN    Y    0.0    NaN      1

Share : facebook icon twitter icon
Ignore nulls in SQL

Ignore nulls in SQL

By : Alireza_Armn
Date : March 29 2020, 07:55 AM
I wish this helpful for you Your test data suggests that the TIME and TYPE are linked, and that the values always rise with time. In which case this solution will work:
code :
select Time
       , Type
       , max(Value_A) as Value_A
       , max(Value_B) as Value_B
from your_table
group by Time
         , Type
select distinct Time
       , Type
       , last_value(Value_A ignore nulls) 
           over (partition by time, type order by Loaded_time_sequence
       , last_value(Value_B ignore nulls) 
           over (partition by time, type order by Loaded_time_sequence
from t23
Format datetime field as MON-YYYY in python pandas & ignore nulls

Format datetime field as MON-YYYY in python pandas & ignore nulls

By : user3377413
Date : March 29 2020, 07:55 AM
To fix the issue you can do is this the format you wanted?
Basically we can drop the NaN rows first and then call apply and use datetime.strftime to apply a new format:
code :
In [24]:

df = df.dropna()
df['fomatted_date'] = df['vendor_created_date'].apply(lambda x: dt.datetime.strftime(x,'%b-%Y'))
           NAME SETID  VENDOR_ID vendor_created_date fomatted_date
0       Vendor1    SD         93 2002-11-22 11:04:33      Nov-2002
1       Vendor2    SD         94 2003-08-09 11:40:59      Aug-2003
2      Service1    SD         95 2003-10-31 10:29:21      Oct-2003
Order by min of two dates with nulls first for one column, ignore nulls for another

Order by min of two dates with nulls first for one column, ignore nulls for another

By : Puspahas Das
Date : March 29 2020, 07:55 AM
hop of those help? I want to order my data by the minimum date of two columns, with equal precedence. If Date1 has nulls, I want them to appear first. If Date2 has nulls, I just want to go by Date1. If both dates are null, it should appear at the top. , LEAST and COALESCE should give you what you're after:
code :
with sample_data as (select to_date('01/01/2012', 'dd/mm/yyyy') date1, to_date('01/01/2000', 'dd/mm/yyyy') date2 from dual union all
                     select null date1, null date2 from dual union all
                     select to_date('01/01/2009', 'dd/mm/yyyy') date1, to_date('01/01/2015', 'dd/mm/yyyy') date2 from dual union all
                     select to_date('01/01/2013', 'dd/mm/yyyy') date1, null date2 from dual union all
                     select to_date('01/01/2003', 'dd/mm/yyyy') date1, to_date('01/01/2003', 'dd/mm/yyyy') date2 from dual)
select date1,
from   sample_data
order by least(date1, coalesce(date2, date1)) nulls first;

DATE1      DATE2     
---------- ----------

01/01/2012 01/01/2000
01/01/2003 01/01/2003
01/01/2009 01/01/2015
GROUP BY but ignore nulls unless no not-nulls

GROUP BY but ignore nulls unless no not-nulls

By : Wiinterfell
Date : March 29 2020, 07:55 AM
it helps some times Imagine you have two lists; a list of drivers and a list of vehicles.
You want the complete list of drivers, plus any vehicle records if they exist.
code :
SELECT    drivers.driver_uuid,
FROM      driver_vehicle_documents drivers
LEFT JOIN driver_vehicle_documents vehicles ON  vehicles.driver_uuid = drivers.driver_uuid 
                                            AND vehicles.vehicle_uuid IS NOT NULL
Replacing nulls by fillna still returns nulls in pandas

Replacing nulls by fillna still returns nulls in pandas

By : Dave Magno
Date : March 29 2020, 07:55 AM
it fixes the issue Inplace fillna does not work on pd.Series columns because they return a copy, and the copy is modified, leaving the original untouched.
Why not just do -
code :
df.loc[:, 'A':'D'] = df.loc[:, 'A':'D'].fillna('Global') 
df.loc[:, ['A', 'B', 'C', 'D']] = df.loc[:, ['A', 'B', 'C', 'D']].fillna('Global')
Related Posts Related Posts :
  • Tuning the hyperparameter with gridsearch results in overfitting
  • some coordinates that I extracted from geocoder in Python are not saving in the variable I created
  • 7C in cs circles- python Im not sure what is wrong with this yet
  • How to fix 'AttributeError: 'list' object has no attribute 'shape'' error in python with Tensorflow / Keras when loading
  • python - thread`s target is a method of an object
  • Retrieve Variable From Class
  • What is the reason for matplotlib for printing labels multiple times?
  • Why would people use ThreadPoolExecutor instead of direct function call?
  • When clear_widgets is called, it doesnt remove screens in ScreenManager
  • Python can't import function
  • Pieces doesn't stack after one loop on my connect4
  • How to change font size of all .docx document with python-docx
  • How to store a word with # in .cfg file
  • How to append dictionaries to a dictionary?
  • How can I scrape text within paragraph tag with some other tags then within the paragraph text?
  • Custom entity ruler with SpaCy did not return a match
  • Logging with two handlers - one to file and one to stderr
  • How to do pivot_table in dask with aggfunc 'min'?
  • This for loop displays only the last entry of the student record
  • How to split a string by a specific pattern in number of characters?
  • Python 3: how to scrape research results from a website using CSFR?
  • Setting the scoring parameter of RandomizedSeachCV to r2
  • How to send alert or message from view.py to template?
  • How to add qml ScatterSeries to existing qml defined ChartView?
  • Django + tox: Apps aren't loaded yet
  • My css and images arent showing in django
  • Probability mass function sum 2 dice roll?
  • Cannot call ubuntu 'ulimit' from python subprocess without using shell option
  • Dataframe Timestamp Filter for new/repeating value
  • Problem with clicking select2 dropdownlist in selenium
  • pandas dataframe masks to write values into new column
  • How to click on item in navigation bar on top of page using selenium python?
  • Add multiple EntityRuler with spaCy (ValueError: 'entity_ruler' already exists in pipeline)
  • error when replacing missing ')' using negative look ahead regex in python
  • Is there a way to remove specific strings from indexes using a for loop?
  • select multiple tags by position in beautifulSoup
  • pytest: getting AttributeError: 'CaptureFixture' object has no attribute 'readouterror' capturing stdout
  • Shipping PyGObject/GTK+ app on Windows with MingW
  • Python script to deduplicate lines in multiple files
  • How to prevent window and widgets in a pyqt5 application from changing size when the visibility of one widget is altered
  • How to draw stacked bar plot from df.groupby('feature')['label'].value_counts()
  • Python subprocess doesn't work without sleep
  • How can I adjust 'the time' in python with module Re
  • Join original np array with resulting np array in a form of dictionary? multidimensional array? etc?
  • Forcing labels on histograms in each individual graph in a figure
  • For an infinite dataset, is the data used in each epoch the same?
  • Is there a more efficent way to extend a string?
  • Is it possible to do this loop in a one-liner?
  • invalid literal for int() with base 10: - django
  • Why does my code print a value that I have not assigned as yet?
  • the collatz func in automate boring stuff with python
  • How to find all possible combinations of parameters and funtions
  • about backpropagation deep neural network in tensorflow
  • Sort strings in pandas
  • How do access my flask app hosted in docker?
  • Replace the sentence include some text with Python regex
  • Counting the most common element in a 2D List in Python
  • logout a user from the system using a function in python
  • mp4 metadata not found but exists
  • Django: QuerySet with ExpressionWrapper
  • shadow
    Privacy Policy - Terms - Contact Us © festivalmusicasacra.org