Python: Create an iterator from several iterators
Python Itertools: Exercise-1 with Solution
Write a Python program to create an iterator from several iterables in a sequence and display the type and elements of the new iterator.
Sample Solution:
Python Code:
from itertools import chain
def chain_func(l1,l2,l3):
return chain(l1,l2,l3)
#List
result = chain_func([1,2,3], ['a','b','c','d'], [4,5,6,7,8,9])
print("Type of the new iterator:")
print(type(result))
print("Elements of the new iterator:")
for i in result:
print(i)
#Tuple
result = chain_func((10,20,30,40), ('A','B','C','D'), (40,50,60,70,80,90))
print("Type of the new iterator:")
print(type(result))
print("Elements of the new iterator:")
for i in result:
print(i)
Sample Output:
Type of the new iterator: <class 'itertools.chain'> Elements of the new iterator: 1 2 3 a b c d 4 5 6 7 8 9 Type of the new iterator: <class 'itertools.chain'> Elements of the new iterator: 10 20 30 40 A B C D 40 50 60 70 80 90
Python Code Editor:
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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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