ex05 ok

d00/ex05/building.py

@@ -0,0 +1,53 @@
+def get_message(argv: list[str]) -> str:
+    """check arguments and return string"""
+
+    # https://docs.python.org/3.10/reference/simple_stmts.html?highlight=assert#the-assert-statement
+    assert len(argv) < 3, "too much arguments"
+
+    if len(argv) == 2:
+        return argv[1]
+
+    # stdin https://docs.python.org/3/library/sys.html#sys.stdin
+    print("What is the text to count?")
+    msg = sys.stdin.readline()
+    return msg
+
+
+def main(argv: list[str]):
+    """displays stats on string"""
+
+    try:
+        msg = get_message(argv)
+    except AssertionError as err:
+        print("AssertionError:", err)
+        return
+
+
+    char_count = len(msg)
+    print("The text contains", char_count,"characters:")
+
+    # filter() https://docs.python.org/3.10/library/functions.html#filter
+    upper_count = len(list(filter(str.isupper, msg)))
+    print(upper_count, "upper letters")
+
+    # generator expressions https://docs.python.org/3.10/reference/expressions.html#generator-expressions
+    lower_count = sum(1 for char in msg if char.islower())
+    print(lower_count, "lower letters")
+
+    # in https://docs.python.org/3/reference/expressions.html#in
+    punctuation = r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
+    punctuation_count = sum(1 for char in msg if char in punctuation)
+    print(punctuation_count, "punctuation marks")
+
+    # array.count() https://docs.python.org/3.10/library/array.html?highlight=count#array.array.count
+    space_count = msg.count(" ") + msg.count("\n")
+    print(space_count, "spaces")
+
+    # list comprehension https://docs.python.org/3.10/tutorial/datastructures.html#list-comprehensions
+    digits_count = len([char for char in msg if char.isdigit()])
+    print(digits_count, "digits")
+
+
+if __name__ == "__main__":
+    import sys
+    main(sys.argv)