Intro to Programming Flashcards
The output of the input function is always a
string
pros/cons of python
- can quickly write programs
- no overhead
cons: not as fast/efficiently
Why to not use word processor?
screw up the formatting
Process for programs to be ready by computer
program is yranslated into binary machine language
do not click on the previously created program to open it because….
operating system will try to run python programs (not allow you to edit it)
Naming files (2)
- no spaces
- Use alphabetical characters, numbers may be used but the first number is only alphabetic
Variables (3)
used to do what?+what happen if u put anothe info in+accesibility?
- Used to store information (temporary)
- can store one piece, putting another peice can overwrite previous entry
- at most the info will be accesible as long as the program runs
type of info that can be stored in variables: (3)
- integers (whole number)
- floating point (fractional)
- strings (character info)
The assignment operator+ tell me about photocopying (y=3 x=y y=6)
- not the same as equal
- you change y when y=x, x doesnt change
When naming a variable (3)
- names must start with a letter and should not behin with an underscore
- should be all lower case
division symbol
/
integer division symbol+ what it does
//
9//2 ->4
exponent symbol
**
order of operation (2)
- brackets, exponent, multiplication/division/modulo, addition/subtraction, assignment
- If there are multiple operations that are on the same level then prescendance goes from left to right
Triple quote
Prints exactly what you typed
bits
A bit in computer science holds the information of a ‘yes-no’ question - 1 means yes, 0 means no.
When you put a few bits together you can represent a larger number (think combinations).
With a larger number you can represent letters from an alphabet or colors on a screen or volume levels of sound and music.
And there you have it — a computer system, built on the bit.
converting float to integers will
not round the number, just cut off
”+ with strings”
Concatention
+ with non strings
- can do it with integers and float
- literally adds it
+ with integers:
what happens if:
print format with format specifiers:
print (“course: %s%d” %(num, sum))
print format with format specifiers:
print (“course: %s%d” %(num, sum))
%d
integer
%f
floating point
What does print (“$3s-3%s” %(“ab”, “ab”)) look like?
positive integer add leading spaces…
before the information to display (Right alighn)
print (“%f%%” %(100)) gives
100.000000000%
\a
alarm causes the program to beep
\n
new line moves cursor to begining of the next line
\t
tab moves curesor forward one tab stop
'
single quote prints a single quote
'’
prints a double quote
\
prints one blackslash
