46 Simple Python Exercises 16-22题

#Write a function filter_long_words() that takes a list of words
# and an integer n and returns the list of words that are longer than n.
def filter_long_words(list,n):
    words = []
    for word in list:
        if len(word)>n:
            words.append(word)
    return (words)
print(filter_long_words([‘abc‘,‘long‘,‘filter‘,‘return‘],4))

#Write a version of a palindrome recognizer that also accepts phrase palindromes
# such as "Go hang a salami I‘m a lasagna hog.", "Was it a rat I saw?", "Step on no pets",
# "Sit on a potato pan, Otis", "Lisa Bonet ate no basil", "Satan, oscillate my metallic sonatas",
# "I roamed under it as a tired nude Maori", "Rise to vote sir", or the exclamation "Dammit, I‘m mad!".
# Note that punctuation, capitalization, and spacing are usually ignored.
import re
def palindrome_recognizer(words):
    album = []
    word=re.sub(‘[^a-zA-Z]‘,‘‘,words).lower()
    for str in (word):
        album.insert(0, str)
    if word==(‘‘.join(album)):
        return True
    else:
        return  False
a=palindrome_recognizer("I am testing")
print(a)
b=palindrome_recognizer("Go hang a salami I‘m a lasagna hog.")
print(b)
c=palindrome_recognizer("Was it a rat I saw?")
print(c)
d=palindrome_recognizer("Sit on a potato pan, Otis")
print(d)
e=palindrome_recognizer("Dammit, I‘m mad!")
print(e)

#A pangram is a sentence that contains all the letters of the English alphabet at least once,
# for example: The quick brown fox jumps over the lazy dog.
# Your task here is to write a function to check a sentence to see if it is a pangram or not.
import re
def pangram_check(sentence):
    alphabets=[‘a‘, ‘b‘,‘c‘,‘d‘,‘e‘,‘f‘,‘g‘,‘h‘,‘i‘,‘j‘,‘k‘,‘l‘,‘m‘,‘n‘,‘o‘,‘p‘,‘q‘,‘r‘,‘s‘,‘t‘,‘u‘,‘v‘,‘w‘,‘x‘,‘y‘,‘z‘]
    words = re.sub(‘[^a-zA-Z]‘, ‘‘, sentence).lower()
    i=0
    for alphabet in alphabets:
        if alphabet in words:
            i=i+1
    if i==26:
        return  True
    else:
        return False
a="The quick brown fox jumps over the lazy dog."
print(pangram_check(a))
b="The quick brown fox jumps over the lazy cat."
print(pangram_check(b))

#Represent a small bilingual lexicon as a Python dictionary in the following fashion
# {"merry":"god", "christmas":"jul", "and":"och", "happy":gott", "new":"nytt", "year":"ar"}
# and use it to translate your Christmas cards from English into Swedish.
# That is, write a function translate() that takes a list of English words
# and returns a list of Swedish words.
def translate(English_words):
    dictionary={"merry":"god","christmas":"jul","and":"och","happy":"gott","new":"nytt","year":"ar"}
    Swedish=[]
    for words in English_words.lower().split():
        if words in dictionary:
            Swedish.append(dictionary[words])
    return(‘ ‘.join(Swedish))
a=‘Merry christmas‘
print(translate(a))
b=‘HAPPY NEW YEAR‘
print(translate(b))
c=‘Merry Christmas and Happy New Year‘
print(translate(c))

#Write a function char_freq() that takes a string and builds a frequency
# listing of the characters contained in it.
# Represent the frequency listing as a Python dictionary.
#  Try it with something like char_freq("abbabcbdbabdbdbabababcbcbab").
def char_freq(char):
    alphabets=set(char)
    for alphabet in alphabets:
        counts_dict = {alphabet:char.count(alphabet)}
        print (‘{}:{}‘.format(alphabet,counts_dict[alphabet]))
a="abbabcbdbabdbdbabababcbcbab"
char_freq(a)