[Tutor] A Python Newbie Requesting help with Lambdas, Filters, Maps, and Built-in Functions to solve problems for a List of Songs

[Rahul Alawani]

Reposting a somewhat shortened version of my earlier ask based on a fellow user's feedback (thanks Alan G). I still think it's important to share/repeat some background.  Admin/moderator, please feel free to delete my prior post.  Thx.

Hello Tutors!

I am an ambitious Python newbie without any CS background!  I am currently taking an online Python programming course.  I have quite some ways to go.  But based on what I have learned so far (data types, lists/dictionaries/tuples/sets, conditional statements, for and while loops, functions, lambdas, maps and filters, simple built-in functions like min/max/any/all/abs/round/len/ sorted/reversed),

I am trying to solve what I think is an interesting set of problems pertaining to a list of songs (Bollywood artists and songs are listed in the example, but that's NOT important, although it might be too distracting for some people).

I would appreciate it if you could simply focus on the nature of the data to be used and the multi-part problem.  Those willing to help, it might be easier if you copy and paste the below code into a Python 3 text editor/interpreter (whatever works for you).

I have added some comments, too, and hope they will be useful.  I am not looking for a spoon-fed solution to every single unsolved problem.  Just something that would push me over to the next step would suffice.  I know how to solve each of these problems conceptually (anyone can solve them in their mind).  What I'm struggling the most with is the syntax and order of certain functions when solving.  Perhaps I am not considering some intermediate code steps that are required and/or helpful.

Please note that the primary objective is to solve these problems using lambdas, filters, maps, etc. and NOT for or while loops or list comprehensions.  Any help will be greatly appreciated with heartfelt thanks and email fist-bumps.  Thank you for your time and consideration.

Regards,
Rahul A.

So here it goes.........................

# This function accepts a list of several dictionaries that contain song artists' names and their song titles and
# returns the following outputs in tuples (remember to return a tuple for each output!):
# 4. The longest song title in the entire song list
# 6. A tuple containing the name of the artist w/ longest song title and their longest song title
# 7. A tuple containing the name of the artist w/ longest song title and the length of their longest song title
# 9. A list of artists and their longest song titles sorted in descending order of the length of the song title
# 9a. Similar list as original but longest title listed first and shortest title listed last for each artist
# 9b. BONUS: same as 9a above with artists sorted in default ascending order.  Thus the artists will be listed
# in regular alphabetical order, but their song titles will listed in the descending order of title length.

songmix = [
{"artist":"Rafi","titles":["Pukarta chala hoon main","Aapke haseen rukh pe","Thaheriye hosh main aaloon","Woh jab yaad aaye","Deewana hua badal","Ehsan tera hoga mujhpar"]},
{"artist":"Asha","titles":["Aja aja main hun pyar tera","Dil cheez kya hai","Aaiye meherban","Aao huzur tum ko","In aankhon ki masti mein","Paan khaye saiyan humaro"]},
{"artist":"Suman","titles":["Rahete kabhi jinke dil mein","Na tum hamen jano","Jo hum pe guzarti hai","Rahe na rahe hum","Aajkal tere mere pyar ke","Tujhe dekha tujhe chaha","Parbaton ke pedon par","Tumne pukara aur"]},
{"artist":"Kishor","titles":["Beqarar dil","Nile nile ambar pe","Muqaddar ka sikandar","Mere mehboob kayamat hogi","Mere sapno ki rani kab","Pyar diwana hota hai","O mere dil ke chain","Yeh shaam mastani","Pal pal dil ke paas"]},
{"artist":"Lata","titles":["Lag ja gale","Tera jana dil ke armanon ka","Tera mera pyar amar","Yoon hasraton ke daag","Awaz deke hamen tum bulao","Mujhe kitana pyar hai tumse","Mausam hai aashiqana","Tujhe dekha to jana sanam","Salam-e ishq meri jaan","Yeh dil aur unki"]},
{"artist":"Hemant","titles":["Tumhe yaad hoga","Tum pukar lo","Jane wow kaise log the","Neend na mujhko aye","Beqarar karke humein",]},
{"artist":"Talat","titles":["Jalte hain jisake liye","Jayen to jayen kahan"]},
{"artist":"Manna","titles":["Zindagi kaisi hai paheli haye","Poochho na kaise maine rain bitayee","Laga chunari mein daag"]},
{"artist":"Alka","titles":["Akele hain to kya gam hai","Jane kyun log pyar karte hain","Kuchh kuchh hota hai","Pardesi pardesi jana nahi"]}
]

# 4. The longest song title in the entire songs list
def longest_title (songmix):
temp = max(songmix, key=lambda num: len(max(num['titles'])))
return list(map(lambda x: max(songmix, key=lambda num: len(max(num['titles'])))['artist'],
 filter(lambda title: max(len('title')), temp)))
print (longest_title (songmix))

# Error Message in PowerShell:

# Traceback (most recent call last):
#   File ".\Lambdas_Built_in_Functions_Min_Max_Sorted_Adv_short.py", line 33, in <module>
#     print (longest_title (songmix)) # !!! Returns the entire record {...} for the correct artist ('Manna') (but NOT actual song title)
#   File ".\Lambdas_Built_in_Functions_Min_Max_Sorted_Adv_short.py", line 31, in longest_title
#     filter(lambda title: max(len('title')), temp)))
#   File ".\Lambdas_Built_in_Functions_Min_Max_Sorted_Adv_short.py", line 31, in <lambda>
#     filter(lambda title: max(len('title')), temp)))
# TypeError: 'int' object is not iterable

# Remaining Problem Wishlist:
# 6. A tuple containing the name of the artist w/ longest song title and their longest song title
# 7. A tuple containing the name of the artist w/ longest song title and the length of their longest song title
# 9. A list of artists and their longest song titles sorted in descending order of the length of the song title
# 9a. Similar list as original but longest title listed first and shortest title listed last for each artist
# 9b. BONUS: same as 9a above with artists sorted in default ascending order.  Thus the artists will be listed
# in regular alphabetical order, but their song titles will listed in the descending order of title length.