Python Interview Questions 7

61. How will you reverse a list?
list.reverse() − Reverses objects of list in place.

61. How will you sort a list?
list.sort([func]) − Sorts objects of list, use compare func if given.

62. Multiple assignment
>>> target_color_name = first_color_name = 'FireBrick'
>>> id(target_color_name) == id(first_color_name)
True
>>> print(target_color_name)
FireBrick
>>> print(first_color_name)
FireBrick
>>>

63. Word count
import sys

def count_words(filename):
    results = dict()
    with open(filename, 'r') as f:
        for line in f:
            for word in line.split():
                results[word] = results.setdefault(word, 0) + 1

    for word, count in sorted(results.items(), key=lambda x: x[1]):
        print('{} {}'.format(count, word))

count_words(sys.argv[1])

64. Word list
from urllib.request import urlopen

with urlopen('http://sixty-north.com/c/t.txt') as story:
    story_words = []
    for line in story:
        line_words = line.split()
        for word in line_words:
            story_words.append(word)

print(story_words)

65. """Demonstrate scoping."""

count = 0

def show_count():
    print("count = ", count)

def set_count(c):
    global count
    count = c