Python Programming Tutorial - 50 - map

[eyalpery]

Let's use Lambda :)

print(list(map(lambda x: x*2, [10, 30, 75])))

[rong]

This is actually the best python tutorial series I ever found.he makes concepts so simple and explain things so that even a noob can understand. The best thing is he explains things that other tutorial skips and those are often what a beginner would be troubled with. What an amazing job! I can't wait to check out his other tutorials.

[kalaivanysivalingam]

Further topics you could cover:
-Regular Expressions
-Networking
-CGI Programming
-Database Interactions
-optparse
-Generators
-Iterators
-List comprehension
-Decorators (Including standard decorators built into Python, e.g @staticmethod)
-super() function
-enumerate() function
-sockets
-C extensions
-Templates
-Other modules part of Python's standard library (hashlib, pickle etc)

Third party libraries you could teach:
-Twisted (Event driven networking library)
-Django (Web framework - like Flask, but better imo)

Good luck! Most of these topics lack good videos, so it would be great if you could cover them

[nitinpandey]

Damn the views sure dropped to measly 50k. This awesome tutorial deserves more views.

[joeturk]

Really fast really simple explanation! thank you

[jelleburggraaf]

This forloop is half the work and twice as easy. So for what case would you need to use a map function?



income = [10, 30, 75]

for e in income:
e *= 2
print(e)

vs

income = [10, 30, 75]

def double_money(dollars):
return dollars * 2

new_income = list(map(double_money, income))
print(new_income)

[iyaasawa-chanyamete]

Is there any bucky's student who fall in love with his voice.xD lol.

[godishelping]

I typed the code :
income = [10, 20, 30]

def func(dollar):
print(dollar* 2)

list(map(func, income))

AND IT GAVE ME THE CORRECT ANSWER!!!! DON'T KNOW HOW???

[pawebrysch]

3:00 lista_przekształcona = list(map(przekształcenie, lista)) - prawdopodobnie nie można robic działań na listach

[flow]

or you can do something like this:

nub=[45, 23, 23, 89, 456, 789, 123, 890]

def magic_number(number):
magic= number*2+10/2
print(magic)


list(map(magic_number, nub))

[jackscott]

Is anyone having issues with importing AF_PACKET from sockets? PyCharm isn't recognizing it for me.

[DavidAnatolie]

I wrote a lambda function instead of defining one.

[nwood]

I played with the above in idle, it seems that you don't need list in front of the map function, as map will return a list eg
>>> income=[10, 20, 30]
>>> def d(d):
return d*2

>>> ans=map(d, income)
>>> type(ans)
<type 'list'>
>>> ans
[20, 40, 60]
>>>

[impossiblehousemarylandsta]

Not clear tutorial, maybe this is more clear.

def myfunc(n):
return len(n)

x = map(myfunc, ('apple', 'banana', 'cherry'))

You are iterating values and applying the function to each of them and put them in a list

[Naifth]

how to write this same code with "for" command??... pls let me know quickly

[Isaac-gpdq]

why not:
new_income = [double_money(i) for i in income]