Why does map function return None?

Question

I'm trying to code another encrypter, I'm having problems with the decoding process. I've read a lot of StackOverflow's questions about this argument, I alredy know that someone is going to mark this question as a duplicate but I'm writing this because I can't find a solution to my problem. The encode function gives me this string

4697625275273471234347364527724769

That is the encoded message (it says 'Hello world!') and I have the 'Key' (randomly generated every time I start the program), that cointains the combiantions of numbers needed to decode the message. Here is the key

12040512030417060213060413030716060915090216080313040713060215090916020217020419040215050918070812050414030615020715020512061602071404091407041805160407170516030919090718050315070618020719070218050812030317020918060815070817020816040318080414060914060414050419030818030513020419030517040912040218020918030616050313050413040319070618020617060518060314090616070612080615060613020912040413070619070918050217040512070813020816020513090812090218080715020317050217050313070419020717090712060814020816030518040317030616050915020215030516050518080314040619060815030816020613040518080817060913070312080316050717020714070212090915090812090517030916060218091905051608071904041303021209031606081707051209081908041302051808021602081202041508031708041204031608041504031708051307051908081405091809051207091408061805061806021306061902021805041706081902061303031606051803091309061202031504061702021206091402091604041906041709091609061506081908091707021604061604081309051508091905041903031903071202021705061409091205091803071409041505071204061709041909091209061409051309041707031207041709061704021804051907071703031707091605081907051506041308051305071407031708031607021902051802051705041209071909081709051804041804091403021503031507071208051307021507041806051404031904031903061208041607031204071609091904091809031807031206041308091907041908031809071704031807071909021209041509071304041804071309071707061603081305051606031304021208071908021407081803021807021406071808051602041502061903091205051508051206031803081802021503061602031403081403091909061409081703021606071504051609041409031504021308021509051905031206071605021206051507021408021402061907031502041705091504081308081207051902091704061603071503041202061605061303091507091408041906091608061609081504041706071205021405021603041303041305031607081403051703041406061304081306071308061307081602091207061203091403071503091202051607041308071506021407071803031305021309031805091203061906051406031304061704071207071706031508061206021709021404051403041508071704041203071403031306081705051709081708061706041207031909031309091507031708021404041704081702031404071307071203051409071

it's a bit long.

And now that I have the parameters you need to put them in the decoder

input_text = input('Encrypted MSG\n> ')
key = input('Key\n> ')
alphabet = list(" qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890èéòç@à°#ù§[]+*,;.:-_<>£$₽%&()=?ì^/|!ėëęēêĖËĘĒÉÈÊūûüúŪÛÜÚÙīïįíìîĪÏĮÍÌκōøõœöôóŌØÕŒÖÓÒãåāáâäæÃÅĀªÀÁÂÄÆßẞÇñÑ¥¢∆¶×÷π√•`~©®™✓йцукенгшщзхфывапролджэячсмитьбюЙЦУКЕНГШЩЗХФЫВАПРОЛДЖЭЯЧСМИТЬБЮ⌂☻‼‰╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤▬╥╙╘╒╓╫╪┘┌¤█▄▌▐▀αΣσ░▒▓│┤╡╢╖╕╣║╗╝¿þ¼½¾ⁿ⌠⌡≤≥±≡∩∞ΘΩð«»⌐¬¨↨↑↓→←↔₧☼♥♦♣♠♂♀♪◘○◙►◄▲▼Þ‘’“”„☭卐")

key = key.replace('0', '')
key = key.replace('1', ' ')
key = key.split()
key.insert(0,'1')

charmap = zip(key, alphabet)
_map = dict(charmap)
output_text = ''.join(str(_map.get(c)) for c in input_text)

print(f'Output\n> {output_text}')

The output [ACTUAL]

Encrypted MSG
> 4697625275273471234347364527724769
Key
> 12040512030417060213060413030716060915090216080313040713060215090916020217020419040215050918070812050414030615020715020512061602071404091407041805160407170516030919090718050315070618020719070218050812030317020918060815070817020816040318080414060914060414050419030818030513020419030517040912040218020918030616050313050413040319070618020617060518060314090616070612080615060613020912040413070619070918050217040512070813020816020513090812090218080715020317050217050313070419020717090712060814020816030518040317030616050915020215030516050518080314040619060815030816020613040518080817060913070312080316050717020714070212090915090812090517030916060218091905051608071904041303021209031606081707051209081908041302051808021602081202041508031708041204031608041504031708051307051908081405091809051207091408061805061806021306061902021805041706081902061303031606051803091309061202031504061702021206091402091604041906041709091609061506081908091707021604061604081309051508091905041903031903071202021705061409091205091803071409041505071204061709041909091209061409051309041707031207041709061704021804051907071703031707091605081907051506041308051305071407031708031607021902051802051705041209071909081709051804041804091403021503031507071208051307021507041806051404031904031903061208041607031204071609091904091809031807031206041308091907041908031809071704031807071909021209041509071304041804071309071707061603081305051606031304021208071908021407081803021807021406071808051602041502061903091205051508051206031803081802021503061602031403081403091909061409081703021606071504051609041409031504021308021509051905031206071605021206051507021408021402061907031502041705091504081308081207051902091704061603071503041202061605061303091507091408041906091608061609081504041706071205021405021603041303041305031607081403051703041406061304081306071308061307081602091207061203091403071503091202051607041308071506021407071803031305021309031805091203061906051406031304061704071207071706031508061206021709021404051403041508071704041203071403031306081705051709081708061706041207031909031309091507031708021404041704081702031404071307071203051409071
Output
> NoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone NoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone

The output [EXPECTED]

Encrypted MSG
> 4697625275273471234347364527724769
Key
> 12040512030417060213060413030716060915090216080313040713060215090916020217020419040215050918070812050414030615020715020512061602071404091407041805160407170516030919090718050315070618020719070218050812030317020918060815070817020816040318080414060914060414050419030818030513020419030517040912040218020918030616050313050413040319070618020617060518060314090616070612080615060613020912040413070619070918050217040512070813020816020513090812090218080715020317050217050313070419020717090712060814020816030518040317030616050915020215030516050518080314040619060815030816020613040518080817060913070312080316050717020714070212090915090812090517030916060218091905051608071904041303021209031606081707051209081908041302051808021602081202041508031708041204031608041504031708051307051908081405091809051207091408061805061806021306061902021805041706081902061303031606051803091309061202031504061702021206091402091604041906041709091609061506081908091707021604061604081309051508091905041903031903071202021705061409091205091803071409041505071204061709041909091209061409051309041707031207041709061704021804051907071703031707091605081907051506041308051305071407031708031607021902051802051705041209071909081709051804041804091403021503031507071208051307021507041806051404031904031903061208041607031204071609091904091809031807031206041308091907041908031809071704031807071909021209041509071304041804071309071707061603081305051606031304021208071908021407081803021807021406071808051602041502061903091205051508051206031803081802021503061602031403081403091909061409081703021606071504051609041409031504021308021509051905031206071605021206051507021408021402061907031502041705091504081308081207051902091704061603071503041202061605061303091507091408041906091608061609081504041706071205021405021603041303041305031607081403051703041406061304081306071308061307081602091207061203091403071503091202051607041308071506021407071803031305021309031805091203061906051406031304061704071207071706031508061206021709021404051403041508071704041203071403031306081705051709081708061706041207031909031309091507031708021404041704081702031404071307071203051409071
Output
> Hello world!

The debug that I made with Visual Studio Code show that the problem is the map function

Can you help me please?

Thanks

Answer 1

You read one by one digit on the Encrypted message. So if you have a 4 on your encrypted message to find 4 on the map you need to have 141 on your key due to the processing you do on your key.

In your exemple you dont have 141 on your generated key thats why you get None.

I change the key to use 12141512030417060213060413030716060915090216080313040713060215090916020217020419040215050918070812050414030615020715020512061602071404091407041805160407170516030919090718050315070618020719070218050812030317020918060815070817020816040318080414060914060414050419030818030513020419030517040912040218020918030616050313050413040319070618020617060518060314090616070612080615060613020912040413070619070918050217040512070813020816020513090812090218080715020317050217050313070419020717090712060814020816030518040317030616050915020215030516050518080314040619060815030816020613040518080817060913070312080316050717020714070212090915090812090517030916060218091905051608071904041303021209031606081707051209081908041302051808021602081202041508031708041204031608041504031708051307051908081405091809051207091408061805061806021306061902021805041706081902061303031606051803091309061202031504061702021206091402091604041906041709091609061506081908091707021604061604081309051508091905041903031903071202021705061409091205091803071409041505071204061709041909091209061409051309041707031207041709061704021804051907071703031707091605081907051506041308051305071407031708031607021902051802051705041209071909081709051804041804091403021503031507071208051307021507041806051404031904031903061208041607031204071609091904091809031807031206041308091907041908031809071704031807071909021209041509071304041804071309071707061603081305051606031304021208071908021407081803021807021406071808051602041502061903091205051508051206031803081802021503061602031403081403091909061409081703021606071504051609041409031504021308021509051905031206071605021206051507021408021402061907031502041705091504081308081207051902091704061603071503041202061605061303091507091408041906091608061609081504041706071205021405021603041303041305031607081403051703041406061304081306071308061307081602091207061203091403071503091202051607041308071506021407071803031305021309031805091203061906051406031304061704071207071706031508061206021709021404051403041508071704041203071403031306081705051709081708061706041207031909031309091507031708021404041704081702031404071307071203051409071

It finds w for 4 which is the result intended.

Best regards