Python for beginners

Literary Python for Beginners

LETTER * WORD * SENTENCE

• Introduction to the objects string & list with their different attributes
• uses the shell or integrated development environment

• • run python 2.7 – installed by default on all platforms

$ python

>>>

• • install python idle 2.7 – ways to interact with Python: shell + editor

# USING STRINGS

A string is a chain of characters / text and can contain any type of characters

A string is defined by " "

* write letter using STRING

>>> "a"

* write several letters

>>> "a, b, c, d"

* write combinations

>>> "a" + "b"

>>> 3

>>> "a" + "and" + "b"

>>> "a" + " and " + "b"

>>> "a" + "+ " + 3 + " is a3" ***

>>> 3*3

>>> "a" + "+ " + "3" + " is a3"

>>> 3 * "algolit" + " in wtc25"

• • Exercise: Write 'I write the alphabet 3 times.'

Note: there are always different possible solutions

* write string as variable

• • Avoids having to retype your string each time you use it
  • You can change values at any time of the writing process

>>> letter = "a"

>>> print letter

>>> word = "algolit"

>>> print word

>>> sentence = "I learn to read and write again at wtc25"

>>> print sentence, letter

• • Exercise: print your letter, word, sentence

* add punctuation

>>> print letter + " " + word + " " + sentence + "."

>>> print letter + "! " + word + "? " + sentence + "."

>>> letter = "i"

>>> print letter + "! " + word + "? " + sentence + "."

• • Exercise: change content of one of variables, over and over, see how result changes

* calculate!

• • the length of the string

>>> len(letter) >>> len(word) >>> len(sentence)

• • we can also consider the letter/word/sentence as fields or grids, in which each letter occupies a specific position

Note: computer starts to count from 0

>>> word[0] >>> word[3]

• • Exercise: what is the middle letter of your sentence?

* Slicing and concatenating strings in order to select letters & compose new words

• • find last letter

>>> zin[-1]

• • find last but one letter

>>> word[-2]

• • find first two letters

>>> word[0:2]

or

>>> word[:2]

• • find 3 letters in the middle

>>> word[2:5]

• • find from 3rd letter till end

>>> word[2:]

• • Exercise: If the word is "solidarity" is, what do you read here?

word[:5] + word[3:]

• • Exercise: rewrite the word as 'liquidity', using slicing

* write with capitals

>>> print letter.lower()

>>> print sentence.upper()

* write first word of sentence with capital letter

>>> print sentence.capitalize()

* note the difference

>>> sentence.title()

>>> word.title()

Some_Python_Vocabulary

Loops_and_conditions

Anthology