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How to Check Column Nulls and Replace: Pandas

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Here is a post that shows how to count Nulls and replace them with the value you want in the Pandas Dataframe. We have explained the process in two steps - Counting and Replacing the Null values. Count null values (column-wise) in Pandas ## count null values column-wise null_counts = df.isnull(). sum() print(null_counts) ``` Output: ``` Column1    1 Column2    1 Column3    5 dtype: int64 ``` In the above code, we first create a sample Pandas DataFrame `df` with some null values. Then, we use the `isnull()` function to create a DataFrame of the same shape as `df`, where each element is a boolean value indicating whether that element is null or not. Finally, we use the `sum()` function to count the number of null values in each column of the resulting DataFrame. The output shows the count of null values column-wise. to count null values column-wise: ``` df.isnull().sum() ``` ##Code snippet to count null values row-wise: ``` df.isnull().sum(axis=1) ``` In the above code, `df` is the Panda

Python How to Find Day of the Week

DAY of the week Python code you will know here. One is from Calendar, and another one is from a function. Here, I have given my ideas on a better method. Also, the result you can get in a tuple. You might also like Attitude is Everything That Changes Your Life.

Day of Week and Day_Name

  1. Monday 0
  2. Tuesday 1
  3. Wednesday 2
  4. Thursday 3
  5. Friday 4
  6. Saturday 5
  7. Sunday 6
Python: Day of Week How to Calculate
Python: Day of Week How to Calculate

1. Python Logic to get Day of Week from Calendar


from datetime import datetime
import calendar
dt = datetime.today()
dn = dt.weekday()

print("Today is day number: {0}".format(dn))
print("Today is a {0}".format(calendar.day_name[dn]))


Here, the print uses string.format method to print output.


The Output

Python: Day of Week How to Calculate
The result from the first logic


Instead of directly using DateTime, you can write a function - that creates a tuple with Day of week and Day name.

2. Python Logic to get Day and Day_name 

User defined function

from datetime import datetime
from datetime import timedelta
import calendar
def DayOfWeek(d=None):
if d == None:
d = datetime.today()
dn = d.weekday()
return (dn, calendar.day_name[dn])

print(DayOfWeek())
d2 = datetime.today() + timedelta(1)
print(DayOfWeek(d2))


Here, DayOfWeek is a function. You assigned None to d. In the IF, for 'd' and 'dn', you have assigned values. When you Print executes, it returns two values as a tuple.

An object is simply a collection of data (variables) and methods (functions) that act on those data. Similarly, a class is a blueprint for that object.

The Output

Day of week
The result from the second logic


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