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# 14.1 (Display keywords) Revise Listing 14.4 CountKeywords.py to display the keywords
# in a Python source file as well as to count the number of the keywords.
import os.path
import sys
def main():
keyWords = {"and": 0, "as": 0, "assert": 0, "break": 0, "class": 0,
"continue": 0, "def": 0, "del": 0, "elif": 0, "else": 0,
"except": 0, "False": 0, "finally": 0, "for": 0, "from": 0,
"global": 0, "if": 0, "import": 0, "in": 0, "is": 0, "lambda": 0,
"None": 0, "nonlocal": 0, "not": 0, "or": 0, "pass": 0, "raise": 0,
"return": 0, "True": 0, "try": 0, "while": 0, "with": 0, "yield": 0}
filename = input("Enter a Python source code filename: ").strip()
if not os.path.isfile(filename): # Check if target file exists
print("File", filename, "does not exist")
sys.exit()
infile = open(filename, "r") # Open files for input
text = infile.read().split() # Read and split words from the file
count = 0
for word in text:
if word in keyWords:
count += 1
keyWords[word] += 1
print("The number of key words:", count)
for w in keyWords:
if keyWords[w] > 0:
print(w, ":", keyWords[w])
main()
