Revise Listing 14.4 CountKeywords.py to display the key-
words in a Python source file as well as to count the number of the keywords.
LISTING 14.4 CountKeywords.py
1 import os.path
2 import sys
3
4 def main():
5 keyWords = {"and", "as", "assert", "break", "class",
6 "continue", "def", "del", "elif", "else",
7 "except", "False", "finally", "for", "from",
8 "global", "if", "import", "in", "is", "lambda",
9 "None", "nonlocal", "not", "or", "pass", "raise",
10 "return", "True", "try", "while", "with", "yield"}
11
12 filename = input("Enter a Python source code filename: ").strip()
13
14 if not os.path.isfile(filename): # Check if file exists
15 print("File", filename, "does not exist")
16 sys.exit()
17
18 infile = open(filename, "r") # Open files for input
19
20 text = infile.read().split() # Read and split words from the file
21
22 count = 0
23 for word in text:
24 if :
25 count += 1
26
27 print("The number of keywords in", filename, "is", count)
28
29 main()