Python does not support a character type; these are treated as strings of length one, thos also considered a substring.
To access substrings, use the square brackets for slicing along with the index or indices to obtain your substring.
Example:
var1= “Hello World”
print (“var1[0]:”, var1[0])
When the above code is executed, it produces:
var1[0]: H
Gilberto Rogel García
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If you do need to iterate over a sequence of numbers, the built-in function range() comes in handy. It generates lists containing arithmetic progressions, e.g.:
>>> range(10) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
The given end point is never part of the generated list; range(10) generates a list of 10 values, exactly the legal indices for items of a sequence of length 10. It is possible to let the range start at another number, or to specify a different increment (even negative):
>>> range(5, 10) [5, 6, 7, 8, 9] >>> range(0, 10, 3) [0, 3, 6, 9] >>> range(-10, -100, -30) [-10, -40, -70]
To iterate over the indices of a sequence, combine range() and len() as follows:
>>> a = ['Mary', 'had', 'a', 'little', 'lamb'] >>> for i in range(len(a)): ... print i, a[i] ... 0 Mary 1 had 2 a 3 little 4 lamb
My example:
x=[‘mastery25′,’tc1014’]
for i in range (len(x)):
print (“#”,x[i])
>>>#mastery25
>>>#tc1014
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GILBERTO ROGEL GARCÍA
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A tuple is an unchangeable sequence of values.
x=(“Gilberto”,18,”ISC”) #A tuple is written with ()
When you do this you create a tuple with three elements. You can access these elements individually by typing the variable and the then inside brackets directly to the right of the variable type the number of the element to which you are referring.
print (x[o])
>>>Gilberto
Python starts numbering at 0 so Gilberto=0,18=1 and ISC = 2
Packing and Unpacking:
In tuple packing, the values on the left are ‘packed’ together in a tuple:
x=(“Gilberto”,18,”ISC”)
In tuple unpacking, the values in a tuple on the right are ‘unpacked’ into the variables/names on the right:
x=(“Gilberto”,18,”ISC”)
(Name,Age,Studies) = x
print(Name,Age,Studies)
>>>Gilberto 18 ISC
Sources for info. about tuples: Link
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Gilberto Rogel García
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Types are a category for things within Python with which Python will work. Types are integers,float,strings,tuples,lists and dictionaries.
Integers
Whole numbers from negative infinity to infinity, such as 1, 0, -5, etc.
Integers are numeric values and can be stored, manipulated, and expressed inside variables without quotes.
Example:
x=5
print (x)
>>>5
Float
Short for “floating point number,” any rational number, usually used with decimals such as 2.8 or 3.14159.
Strings
A set of letters, numbers, or other characters.
Strings are a type. They are the basic unit of text in Python and all the other types except integers may contain strings.
Example:
x=”Hello World”
print (x)
>>>Hello World
Tuples
A list with a fixed number of elements. ie x=(1,2,3) parentheses makes it a tuple.
A tuple is an unchangeable sequence of values.
Example:
x = (“element 1”, “element 2”, “element 3”)
Lists
A list is a changeable sequence of data. A list is contained by square brackets i.e. [1,2,3]
Example:
x=[1,2,3]
print (x)
>>>[1,2,3]
Dictionaries
A type with multiple elements i.e. x = {1: ‘a’,’b’: 2,3: 3} where you address the elements with, e.g., a text.
Example:
x={‘Hello’:’hola’, ‘Bye’:’adios’}
print(x)
>>> {‘Hello’:’hola’, ‘Bye’:’adios’}
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Gilberto Rogel García
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The zen of python is, according to long time Pythoneer Tim Peters, a set of rules you have to follow or at least to take into account while coding in python which are:
#f9f9f9; background-size: inherit; background-origin: inherit; background-clip: inherit; background-position: inherit; background-repeat: inherit;"> Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
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Gilberto Rogel García
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