Python: Split values into two groups, based on the result of the given filtering function
Python List: Exercise - 217 with Solution
Write a Python program to split values into two groups, based on the result of the given filtering function.
- Use a list comprehension to add elements to groups, based on the value returned by fn for each element.
- If fn returns a truthy value for any element, add it to the first group, otherwise add it to the second group
Sample Solution:
Python Code:
def bifurcate_by(lst, fn):
return [
[x for x in lst if fn(x)],
[x for x in lst if not fn(x)]
]
print(bifurcate_by(['red', 'green', 'black', 'white'], lambda x: x[0] == 'w'))
Sample Output:
[['white'], ['red', 'green', 'black']]
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Previous: Write a Python program to group the elements of a list based on the given function and returns the count of elements in each group.
Next: Write a Python program to sort one list based on another list containing the desired indexes.
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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