Python: Insert an element at the beginning of a given OrderedDictionary
Python Collections: Exercise-22 with Solution
Write a Python program to insert an element at the beginning of a given OrderedDictionary.
Sample Solution:
Python Code:
from collections import OrderedDict
color_orderdict = OrderedDict([('color1', 'Red'), ('color2', 'Green'), ('color3', 'Blue')])
print("Original OrderedDict:")
print(color_orderdict)
print("Insert an element at the beginning of the said OrderedDict:")
color_orderdict.update({'color4':'Orange'})
color_orderdict.move_to_end('color4', last = False)
print("\nUpdated OrderedDict:")
print(color_orderdict)
Sample Output:
Original OrderedDict: OrderedDict([('color1', 'Red'), ('color2', 'Green'), ('color3', 'Blue')]) Insert an element at the beginning of the said OrderedDict: Updated OrderedDict: OrderedDict([('color4', 'Orange'), ('color1', 'Red'), ('color2', 'Green'), ('color3', 'Blue')])
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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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