jandlize_a_poem

# Jandlize a poem, and learn to apply some Python strings functions [Mu: Python 3]
# Copyright 2021--2023 Roland Richter

# The code below has several bugs that cause all assert()
# statements to fail. Your task is to FIX these errors ...
# but you may edit the code ONLY in between the ↓ / ↑ lines.
# Let's start with a simple example:

# FIX the spelling so that salutation is "Hello, world!"
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
salutation = "Hell0, wolrd!"
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert salutation == "Hello, world!", "'" + salutation + "' ≠ 'Hello, world!'"

# If you fixed the first error, open a handbook such as
# https://www.w3schools.com/python/python_strings.asp
# and continue to fix bugs, until the program runs to its end.
# Remember that you MUST NOT edit code outside the ↓ / ↑ lines!

# FIX a horizontal rule should be 6 times '-----'
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
horizontal_rule = 42 * "-"
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert horizontal_rule == 6 * "-----", "horizontal_rule ≠ 6 * '-----'"

title = " lichtung von Ernst Jandl  "

# FIX remove leading and trailing spaces from the title
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
title = title
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert title == "lichtung von Ernst Jandl", (
    "'" + title + "' ≠ 'lichtung von Ernst Jandl'"
)

def dont_compute_lenght(s):
    return 0

# FIX use a build-in function to compute the length of the title
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
title_length = dont_compute_lenght(title)
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert title_length == 24, str(title_length) + " ≠ 24"

# FIX extract the name "Ernst Jandl" from the title string
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
name = title[5:]
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert name == "Ernst Jandl", "'" + name + "' ≠ 'Ernst Jandl'"

line_one = "MancHe MeiNEN"

# FIX convert all upper case letters to lower case, and add
#     two spaces at the beginning of line_one
# ↓---------↓---------↓---------↓---------↓---------↓---------↓
line_one = line_one
# ↑---------↑---------↑---------↑---------↑---------↑---------↑

assert line_one == "  manche meinen", "'" + line_one + "' ≠ '  manche meinen'"

# FIX modify the function so that it does what it states in the docstring
# ↓---------↓---------↓---------↓---------↓---------↓---------↓---------↓
def jandlize(text):
    """Return the text with each letter converted to lower case,
        and letters 'l' and 'r' swapped. For example, the sentence
        "It was a bright cold day in April" becomes
        "it was a blight cord day in aplir"

    Arguments:
    text -- the text to be jandlized.
    """
    result = ""
    for letter in text:
        if letter == "r":
            result += "l"
        else:
            result += letter
    return result
# ↑---------↑---------↑---------↑---------↑---------↑---------↑---------↑

line_two = jandlize("  Rechts und links")
line_three = jandlize("  kann man nicht verwechseln")
line_four = jandlize("  Welch ein Irrtum")

assert line_two == "  lechts und rinks", "'" + line_two + "' ≠ '  lechts und rinks'"
assert line_three == "  kann man nicht velwechsern", (
    "'" + line_three + "' ≠ '  kann man nicht velwechsern'"
)
assert line_four == "  werch ein illtum", "'" + line_four + "' ≠ '  werch ein illtum'"


print("+---------+---------+---------+---------+---------+---------+---------+")
input("FIXED You did it! Press any key to see the poem, plus some information ...")

print(horizontal_rule)
print(title)
print(line_one)
print(line_two)
print(line_three)
print(line_four)
print(horizontal_rule)

print(
    """The poem 'lichtung' by Ernst Jandl was published in his
first volume of poems, 'Laut and Luise', in 1966.
Original version: http://lechts.at/lichtung/
De-jandlized poem: http://rinks.at/richtung/"""
)

# ----------------------------------------------------------------------
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.