How to use 'if name main python' in Python

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13def main():
14 """main"""
15 args = sys.argv[1:]
16
17 if len(args) != 1:
18 print('Usage: {} STR'.format(os.path.basename(sys.argv[0])))
19 sys.exit(1)
20
21 word = args[0]
22 lc_word = word.lower()
23
24 # Method 1:
25 # Create a variable to hold the count
26 # Use a `for` loop to go through each character in the word
27 # If that character is in the list of vowels, increment the counter
28 count = 0
29 for char in word.lower():
30 if char in 'aeiou':
31 count += 1
32
33 # Method 2:
34 # Create a variable to hold the count
35 # Use a `for` loop to go through the list of vowels
36 # Increment the count with the `str.count` function that will
37 # find how many times the vowel occurs in the word
38 # count = 0
39 # for vowel in "aeiou":
40 # count += lc_word.count(vowel)
41
42 # Method 3:
43 # Use a list comprehension instead of a `for` loop to get a list
44 # of integers which are the counts for each vowel
45 # Then use the `sum` function to add them together
46 # count = sum([lc_word.count(v) for v in "aeiou"])
47
48 # Method 4:
49 # Replace the list comprehension with a `map`
50 # count = sum(map(lc_word.count, "aeiou"))
51
52 print('There {} {} vowel{} in "{}."'.format(
53 'are' if count > 1 or count == 0 else 'is',
54 count,
55 '' if count == 1 else 's',
56 word))
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