Python 2.7 Tutorial Pt 5
In this Python Video Tutorial I focus on looping in Python 2.5 through 2.7. I explain how to use the while loop and the many ways to use the for loop.
Along the way I explain how the in operator is used in Python and the range function.
Like always, the code follows the video. If you have any questions or comments leave them below. And, if you missed my other Python Tutorials they are available here:
- Python 2.7 Tutorial Pt 1 : Importing Modules and variable types
- Python 2.7 Tutorial Pt 2: Python Lists & Tuples
- Python 2.7 Tutorial Pt 3: The Print Function & Dictionaries
- Python 2.7 Tutorial Pt 4: The IF Statement & Conditional Expression
The Code Used in the Above Video
#! /usr/bin/python
# While Loops
x = 1
while x <= 30:
print x
x += 1
# for loops
listCustNum = [0,1,2]
listCustName = [‘Bob Smith’,’Helen Jones’,’Mark Summers’]
listCustAge = [23,70,45]
for i in listCustNum:
print ‘%s is %d’ % (listCustName[i],listCustAge[i])
listEx = [1,2,3,4]
print 2 in listEx
for i in listEx:
print i
for i in range(1,31):
print i
listEx[:] = range(1,31)
for i in listEx:
print i
# Print just odd numbers
for i in listEx:
if (i%2) == 0:
continue
else:
print i
# Print odd numbers up till 25
for i in listEx:
if (i%2) == 0:
continue
elif i == 25:
break
else:
print i,
I am working on a program in which I have to read information from a frame arrive from a file(i.e 8 23 11 ). get it from sys.argv vector. then i have to enter all values(i.e 8 23 11) into a table. i have to do it again and again until i reach the last value of the input file. then i have to write the current state of my table to an output text file.this file must hae one line per port
8 23 11 = port number(8),destination address(23) and source address(11) ? ?
Is this a homework assignment? It sounds kind of strange