2 + 3

2 - 3

2 * 3

2**3

2 / 3

5 // 3

5 % 3

2 / 3.  # float

int(2 / 3.)

int('1')

float(1)

float('1.3')

long(1.300)

complex(2, 3)

complex('2+3j')

one = 1

one

two, three, four = 2, 3, 4

print four, three

a = b = c = 1

a

b

c

#working only with python3
a, *b, c = [1, 2, 3, 4, 5, 6]
a == 1
b == [2, 3, 4, 5]
c == 6

complex0 = -3j  # complex

complex0.imag

complex0.real

complex0**2

abs(-1.45)

pow(2, 3)

import math
round(math.pi, ndigits=3)

x = 2 # assign a variable
y = 3
x * y

math.sin(math.pi/2.) # use functions and variables from the math library
# if you import the math library with:
# from math import *
# become: sin(pi/2.)

true = True
false = False
none = None
one = 1
zero = 0
a = 'a'

true is True # use "is" to check that is the same object

false is not True

true == True

one > zero # >/>=/</<=

one > zero and zero > -one

one < zero or zero < -one

string ='qwertyuiopasdfghjklzxcvbnm'

string[0]  # get the first element of the string

len(string)  # get the lenght of the string

string[25]  # get the last element of the string

string[-1]  # get the last

string[0:6] # start=0, stop=6

string[::3] # step=3





unicodestr = u'àèéìçòù'

unicodestr[:3]

print unicodestr[:3]

numb = '0123-5678'

numb[4]

numb[4] = 4

'a'+'b'+'c'

'abc'-'c'

'a'*4





multirow = 'Things that I like in python:\n    - syntax;\n    - power.\n'
print multirow

multirow = """Things that I like in python:
    - syntax;
    - power.
"""
print multirow

findstr = "find something inside"

findstr.find('s')

findstr[9:]

findstr[9:].find('s')

print(multirow.replace('syntax', "it's nice"))

stripstr = '   some spaces    '

stripstr.strip() # try the effect of: lstrip, rstrip

splitstr = "split a long phrase, with a lot of words!"

splitstr.split()  # specify with character should be use to split the string, the defaul is ' '



character = 'A strAngE strIng'
character.lower()

numbers = '1234'
numbers.isdigit()

'python is %s!!!' % 'beautiful'

import math
'number int: %05d, float: %f' % (15, math.pi)

'number int: %d, float: %05.2f' % (15, math.pi*100)

'list: %r' % [1,2,3,4]

'SELECT {cols} FROM {table}'.format(cols='cat, name', table='streets')

'SELECT {} FROM {}'.format('cat, name','streets')



integer = -12345
double = 3.141592653589793
word = 'python'
Get the following strings [3 minutes]:
"Still missing: -12345 €"
"the pigreco value is around: 3.14159"
"   python   "






list_one = ["a", "b", "c", [1,2,3], "d"]

list_one

list_one[1]

list_one[0]

list_one[-2]

list_one[1:4]

list_one[::2]

list_one[::-1]

list_one.append('a')

list_one.count('a')

len(list_one)

list_one.pop(-1)

list_one.sort()

list_one

list_one.index('b')

list_one.extend(['e','f','g','h'])

list_one

list_one[0][0:0]=[0]
list_one

list_one.insert(1, [4,5,6])
list_one

list_one[-3:]=[]
list_one

list_one.remove('e')
list_one

'a' in list_one

tuple_one = (1,2,3,':-)')

tuple_one.index(2)

tuple_one.count(':-)')

2 in tuple_one

tuple_one[0]

tuple_one[0] = 10

gis = set(['arcgis', 'mapinfo', 'qgis', 'grass', 'udig'])
opensource = set(['qgis', 'grass', 'udig'])
usingpython = set(['qgis', 'grass', 'arcgis'])

gis - opensource

opensource & usingpython  # and

opensource ^ usingpython  # or

contact = {'pietro': 333123808, 'jonh': 123123123}

contact['pietro']

contact['pietro'] = {'cell': 333123808, 'tel': 04545454}

contact['pietro']['cell']



contact.keys()



type(contact)

type(1)

isinstance(contact, dict)