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convert list of int to floats
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you can use a list comprehension:
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Last edited by scru; Feb 13th, 2009 at 8:00 am.
hi scru,
it wud b more helpful if u can explain the above sol for this scenario
suppose if i give
>>> l1=[1,2,3,4,5]
>>> l1
[1, 2, 3, 4, 5]
i want l1 to print [1.0,2.0,3.0.....](in float)
it wud b more helpful if u can explain the above sol for this scenario
suppose if i give
>>> l1=[1,2,3,4,5]
>>> l1
[1, 2, 3, 4, 5]
i want l1 to print [1.0,2.0,3.0.....](in float)
Then you would do:
[float(i) for i in l1] is what is known as a list comprehension. You should be already familiar with the for loop which loops through each integer in the list and assigns it to the variable i. The first expression simply tells the comprehension what value to append to the new list; the value here is float(i). So essentially, the comprehension loops through each integer in the list, converts it to a float, and then appends it to a new one which is the assigned to l2.
python Syntax (Toggle Plain Text)
[float(i) for i in l1] is what is known as a list comprehension. You should be already familiar with the for loop which loops through each integer in the list and assigns it to the variable i. The first expression simply tells the comprehension what value to append to the new list; the value here is float(i). So essentially, the comprehension loops through each integer in the list, converts it to a float, and then appends it to a new one which is the assigned to l2.
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Join Date: Aug 2005
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Just an observation, I would avoid using variable names like l1, l2 and so on, they look a lot like numbers 11, 12.
Here is an example how to use Python function map():
Here is an example how to use Python function map():
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drink her pretty in burbank
thanks scru and ene... 
i think i've to go through basics well..and which book do u think is best and easy to learn for beginners in python??
i think i've to go through basics well..and which book do u think is best and easy to learn for beginners in python??
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Join Date: Aug 2005
Posts: 1,593
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There are a flock of badly written and rather outdated Python books on the market. I would go for some of the free online books.
Swaroop C.H. has rewritten his excellent beginning Python tutorial for Python30:
http://www.swaroopch.com/notes/Pytho...le_of_Contents
How to Think Like a Computer Scientist - Learning with Python
written by a college professor, a high school teacher, and a professional programmer:
http://www.thinkpython.com
Foreword by David Beazley, University of Chicago:
http://www.greenteapress.com/thinkpy.../foreword.html
http://www.ibiblio.org/obp/thinkCSpy/
Above updated: "Think like a Python Programmer" (PDF format):
http://greenteapress.com/thinkpython/thinkPP.pdf
Swaroop C.H. has rewritten his excellent beginning Python tutorial for Python30:
http://www.swaroopch.com/notes/Pytho...le_of_Contents
How to Think Like a Computer Scientist - Learning with Python
written by a college professor, a high school teacher, and a professional programmer:
http://www.thinkpython.com
Foreword by David Beazley, University of Chicago:
http://www.greenteapress.com/thinkpy.../foreword.html
http://www.ibiblio.org/obp/thinkCSpy/
Above updated: "Think like a Python Programmer" (PDF format):
http://greenteapress.com/thinkpython/thinkPP.pdf
drink her pretty in burbank
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Practically a Master Poster
I really like the text we used for my high-school level class: Python Programming for the Absolute Beginner. Two caveats -- it's game-oriented, and it doesn't use Python 3.0.
That said, it contains clear explanations and models reasonably good programming practices.
Jeff
That said, it contains clear explanations and models reasonably good programming practices.
Jeff
I second jrcagle's recommendation. I used it in high school too. It's a nice lighthearted approach that explains the major concepts of object-oriented programming fairly well, as well as a pretty good introduction to Python itself.
I remember actually looking forward to reading ahead with this book in my free time.
I remember actually looking forward to reading ahead with this book in my free time.
Last edited by scru; Feb 16th, 2009 at 5:17 pm.
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