Applied Programming/Strings/Python3
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strings.py[edit | edit source]
"""This program counts words in entered strings.
Input:
Text string
Output:
Word count
Example:
Enter a string or press <Enter> to quit:
The cat in the hat.
You entered 5 words.
Enter a string or press <Enter> to quit:
...
References:
None
"""
import sys
def get_text():
"""Gets text string.
Args:
None
Returns:
string: Text string entered or None if no string entered.
"""
print("Enter a string or press <Enter> to quit:")
text = input()
if text == "":
return None
else:
return text
def count_words(text):
"""Counts words in text.
Args:
text (string): text with words to be counted.
Returns:
integer: Count of words in text.
"""
SEPARATORS = " ~`!@#$%^&*()-_=+{}[]|\\:;""'<>,.?/"
word_count = 0
in_word = False
for i in range(0, len(text)):
if not in_word and text[i] not in SEPARATORS:
word_count += 1
in_word = True
elif in_word and text[i] in SEPARATORS:
in_word = False
return word_count
def slice_first_word(text):
"""Removes the first word in text.
Args:
text (string): text with words.
Returns:
sliced_text (string): Text with the first word removed.
"""
SEPARATORS = " ~`!@#$%^&*()-_=+{}[]|\\:;""'<>,.?/"
index = 0
for i in range(len(text)):
if text[i] in SEPARATORS:
break
else: index += 1
sliced_text = text[(index + 1):(len(text))]
return sliced_text
def main():
"""Runs the main program logic."""
try:
while True:
text = get_text()
if text == None:
break
print(f"You entered {count_words(text)} words.\n")
print("Here is your string with the first word sliced:\n")
print(slice_first_word(text))
except:
print("Unexpected error.")
print("Error:", sys.exc_info()[1])
print("File: ", sys.exc_info()[2].tb_frame.f_code.co_filename)
print("Line: ", sys.exc_info()[2].tb_lineno)
main()
Try It[edit | edit source]
Copy and paste the code above into one of the following free online development environments or use your own Python3 compiler / interpreter / IDE.
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