From the terminal, write:
You must see something like below:
Now everything you write is immediately executed.
Try to write this sequence of statements:
You must see something like below:
 

From the terminal, write:

cat /etc/issue
or
lsb_release -a
May be helpful to know which kernel version is running on our Ubuntu. This one sees with:
uname -r

lsusb
or
dmesg
Remember that before to use your serial port you must change the permission on it.
To do this use the commands below.
cd /dev
if your serial port is ttyUSB0 use this command:
chmod 777 ttyUSB0

/dev
and the USB/RS232, normally, is: ttyUSB0 (if you has just one)

The basic operators are:
+  -  /  *
assignment =
comparisons ==, <, >, ! =, <>, <=, >=
modulo % operator, returns the integer remainder of the division, see below.

Using two multiplication symbols ** makes a power relationship.

example

Python supports concatenating strings using the addition operator:

Python also supports multiplying strings to form a string with a repeating sequence:

Lists can be joined with the addition operators:


Arithmetic Operators - See the example here.


Comparison Operators - See the example here.


Assignment Operators - See the example here.


Bitwise Operators - See the example here.


Logical Operators - See the example here.


Membership Operators - See the example here.


Identity Operators - See the example here.


Operators Precedence - See the example here.

#!/usr/bin/python

list1, list2 = [123, 'xyz', 'zara'], [456, 'abc']

print "First list length : ", len(list1);
print "Second list length : ", len(list2);

• s.lower(), s.upper() -- returns the lowercase or uppercase version of the string
• s.strip() -- returns a string with whitespace removed from the start and end
• s.isalpha()/s.isdigit()/s.isspace()... -- tests if all the string chars are in the various character classes
• s.startswith('other'), s.endswith('other') -- tests if the string starts or ends with the given other string
• s.find('other') -- searches for the given other string (not a regular expression) within s, and returns the first index where it begins or -1 if not found
• s.replace('old', 'new') -- returns a string where all occurrences of 'old' have been replaced by 'new'
• s.split('delim') -- returns a list of substrings separated by the given delimiter. The delimiter is not a regular expression, it's just text. 'aaa,bbb,ccc'.split(',') -> ['aaa', 'bbb', 'ccc']. As a convenient special case s.split() (with no arguments) splits on all whitespace chars.
• s.join(list) -- opposite of split(), joins the elements in the given list together using the string as the delimiter. e.g. '---'.join(['aaa', 'bbb', 'ccc']) -> aaa---bbb---ccc

The "slice" syntax is a handy way to refer to sub-parts of sequences -- typically strings and lists.
The slice string[start:end] is the elements beginning at start and extending up to but not including end.  Suppose we have pippo = "12345"
Remeber that:

example

>>> text = "%d little pigs come out or I'll %s and %s and %s" % (3, 'huff', 'puff', 'blow down')
>>> print text
3 little pigs come out or I'll huff and puff and blow down
>>>

>>> ustring = u'A unicode \u018e string \xf1'
>>> print ustring
A unicode Ǝ string ñ
>>>

a=input("Insert NUMBER: ")
print a

raw_input is used for input string from keyboard

example

Val = raw_input("Write your name: ")
print Val

example

  mood = "terrible"
  speed = 110
  if speed >= 80:
    print 'License and registration please'
    if mood == 'terrible' or speed >= 100:
      print 'You have the right to remain silent.'
    elif mood == 'bad' or speed >= 90:
      print "I'm going to have to write you a ticket."
      write_ticket()
    else:
      print "Let's try to keep it under 80 ok?"

See:

for var in list

example

#!/usr/bin/python

squares = [1, 4, 9, 16]
sum = 0
for num in squares:
        sum += num
print sum

#!/usr/bin/python

list = ['mamma', 'padre', 'cane']
if 'mamma' in list:
    print 'Here is ' + list[0]

If you do need to iterate over a sequence of numbers, the built-in function range() comes in handy.

example

example

while

colors = ['green', 'white', 'red']
print colors[0]    ## green
print colors[2]    ## white
print len(colors)  ## red

colors ----> green  white  red
index ----->   0      1     2

mylist = []
mylist.append(10)
mylist.append(20)
mylist.append(30)
print(mylist[0]) # prints 10
print(mylist[1]) # prints 20
print(mylist[2]) # prints 30

# prints out 10,20,30
for x in mylist:
    print x

list.append(x)
Add an item to the end of the list; equivalent to a[len(a):] = [x].

list.extend(L)
Extend the list by appending all the items in the given list; equivalent to a[len(a):] = L.

list.insert(i, x)
Insert an item at a given position. The first argument is the index of the element before which to insert, so a.insert(0, x) inserts at the front of the list, and a.insert(len(a), x) is equivalent to a.append(x).

list.remove(x)
Remove the first item from the list whose value is x. It is an error if there is no such item.

list.pop([i])
Remove the item at the given position in the list, and return it. If no index is specified, a.pop() removes and returns the last item in the list. (The square brackets around the i in the method signature denote that the parameter is optional, not that you should type square brackets at that position. You will see this notation frequently in the Python Library Reference.)

list.index(x)
Return the index in the list of the first item whose value is x. It is an error if there is no such item.

list.count(x)
Return the number of times x appears in the list.

list.sort()
Sort the items of the list, in place.

list.reverse()
Reverse the elements of the list, in place.

file_object = open(file_name [, access_mode][, buffering])

#!/usr/bin/python

# Echo the contents of a file
f = open('prova.py', 'rU')
for line in f:   ## iterates over the lines of the file
  print line,    ## trailing , so print does not add an end-of-line char
                 ## since 'line' already includes the end-of line.
f.close()

Attribute        Description
file.closed      Returns true if file is closed, false otherwise.
file.mode        Returns access mode with which file was opened.
file.name        Returns name of the file.
file.softspace   Returns false if space explicitly required with print, true otherwise.