Category: Python Answers

Sometimes, we want to calculate time difference between two Python Pandas columns in hours and minutes.

In this article, we’ll look at how to calculate time difference between two Python Pandas columns in hours and minutes.

How to calculate time difference between two Python Pandas columns in hours and minutes?

To calculate time difference between two Python Pandas columns in hours and minutes, we can subtract the datetime objects directly.

For instance, we write:

import pandas

df = pandas.DataFrame(columns=['to', 'fr', 'ans'])
df.to = [
    pandas.Timestamp('2020-01-24 13:03:12.050000'),
    pandas.Timestamp('2020-01-27 11:57:18.240000'),
    pandas.Timestamp('2020-01-23 10:07:47.660000')
]
df.fr = [
    pandas.Timestamp('2020-01-26 23:41:21.870000'),
    pandas.Timestamp('2020-01-27 15:38:22.540000'),
    pandas.Timestamp('2020-01-23 18:50:41.420000')
]
df.ans = (df.fr - df.to).astype('timedelta64[h]')
print(df)

We create a Panda DataFrame with 3 columns.

Then we set the values of the to and fr columns to Pandas timestamps.

Next, we subtract the values from df.fr by df.toand convert the type totimedelta64withastypeand assign that todf.ans`.

Therefore, df is:

                       to                      fr   ans
0 2020-01-24 13:03:12.050 2020-01-26 23:41:21.870  58.0
1 2020-01-27 11:57:18.240 2020-01-27 15:38:22.540   3.0
2 2020-01-23 10:07:47.660 2020-01-23 18:50:41.420   8.0

according to what’s printed.

Conclusion

To calculate time difference between two Python Pandas columns in hours and minutes, we can subtract the datetime objects directly.

Sometimes, we want to get the ASCII value of a character with Python.

In this article, we’ll look at how to get the ASCII value of a character with Python.

How to get the ASCII value of a character with Python?

To get the ASCII value of a character with Python, we can use the chr function.

For instance, we write:

c = chr(97)
print(c)

We call chr with the ASCII character code for ‘a’.

And then we assign the return character string to c.

Therefore, c is 'a'.

Conclusion

To get the ASCII value of a character with Python, we can use the chr function.

Sometimes, we want to use named tuples in Python.

In this article, we’ll look at how to use named tuples in Python.

How to use named tuples in Python?

To use named tuples in Python, we can use the namedtuple function from the collections module.

For instance, we write:

from collections import namedtuple
from math import sqrt

Point = namedtuple('Point', 'x y')
pt1 = Point(1.0, 5.0)
pt2 = Point(2.5, 1.5)

line_length = sqrt((pt1.x - pt2.x)**2 + (pt1.y - pt2.y)**2)

print(line_length)

We call namedtuple with the class name and the attributes of the named tuple.

We assign the returned class to Point.

Then we can create Point instances by passing in the values for x and y respectively.

Next, we call sqrt with (pt1.x - pt2.x)**2 + (pt1.y - pt2.y)**2 to calculate the Euclidean distance between pt1 and pt2.

And so line_length is 3.8078865529319543.

Conclusion

To use named tuples in Python, we can use the namedtuple function from the collections module.

Sometimes, we want to delete a file or folder in Python.

In this article, we’ll look at how to delete a file or folder in Python.

How to delete a file or folder in Python?

To delete a file or folder in Python, we can use the os.remove method.

For instance, we write:

import os

os.remove("data.txt")

We call os.remove with the path of the file or folder to remove.

Conclusion

To delete a file or folder in Python, we can use the os.remove method.

Sometimes, we want to check if all elements in a list are identical in Python.

In this article, we’ll look at how to check if all elements in a list are identical in Python.

How to check if all elements in a list are identical in Python?

To check if all elements in a list are identical in Python, we can convert the list to a set and check whether the set’s length is 1 or shorter.

For instance, we write:

the_list = [1, 1, 1, 1, 1]

all_same = len(set(the_list)) <= 1
print(all_same)

We define the the_list list with all 1’s.

Then we call set with the_list to convert it to a set.

Next, we get the length of the set with len.

And we check that the set’s length is 1 or less than return that.

Finally, we assign the result to all_same.

Therefore, all_same is True.

Conclusion

To check if all elements in a list are identical in Python, we can convert the list to a set and check whether the set’s length is 1 or shorter.