Python: Difference between revisions
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type(number) (tells what a variable is.) | type(number) (tells what a variable is.) | ||
print "number is a", type(number) | print "number is a", type(number) | ||
=while loop= | |||
print number interval. | |||
start = input("Start number? ") | |||
stop = input("Stop number? ") | |||
a = start | |||
while a < stop: | |||
print a | |||
a = a + 1 |
Revision as of 20:46, 6 October 2011
links
http://en.wikibooks.org/wiki/Non-Programmer%27s_Tutorial_for_Python_2.6 http://docs.python.org/tutorial
Reference
http://docs.python.org/ref/ref.html
basics
print "Hello, World!"
command called print followed by one argument,which is "Hello, World!". (referred to as a string of characters, or string) Command and its arguments are collectively referred to as a statement,
print "2 + 2 is", 2 + 2
The first argument is the string "2 + 2 is" and the second argument is the mathematical expression 2 + 2, which is commonly referred to as an expression. each of the arguments separated by a comma
sys.argv arguments are passed to the script in the variable sys.argv # is used to start a comment
operations for numbers
Operation | Symbol | Example |
---|---|---|
Power (exponentiation) | **
|
5 ** 2 == 25
|
Multiplication | *
|
2 * 3 == 6
|
Division | /
|
14 / 3 == 4
|
Remainder (modulo) | %
|
14 % 3 == 2
|
Addition | +
|
1 + 2 == 3
|
Subtraction | -
|
4 - 3 == 1
|
userinput
raw_input (returns a string)
user_reply = raw_input("Who goes there? ")
input (returns digits)
number = input("Type in a number: ")
type(number) (tells what a variable is.)
print "number is a", type(number)
while loop
print number interval.
start = input("Start number? ") stop = input("Stop number? ") a = start while a < stop: print a a = a + 1