Summary OCR EXAM REFERENCE LANGUAGE TO PYTHON GUIDE - BY CSandRS
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Course
Computing
Institution
GCSE
Contains all the ERL (OCR exam reference language) listed out in the OCR specification alongside how to write the same in PYTHON. For J277 OCR GCSE. Contains all the Advanced PYTHON topics you need (like functions, file handling, string manipulation etc). I also have separate notes for paper 1 & 2 ...
PYTHON OCR REFERENCE LANGUAGE
SELECTION
If/elseif
if pi == 3.14: if pi == 3.14 then
print(“Good”) print("Good")
elif pi == 3: elseif pi == 3 then
print(“ok...”) print("ok...")
else: else
print(“wrong!”) print("wrong!")
endif
Switch/case
match name: switch name:
case "1": case "1":
print("1") print("1")
case "2": case "2":
print("2") print("2")
case default: default:
print("????") print("????")
endswitch
ITERATION
FOR (count-controlled)
for count in range(1,11,2): for count = 1 to 10 step 2
# 11 is exclusive print(count)
print(count) next count
WHILE (condition controlled) - pre-check. Might never run
while continue == “Y” While continue == “Y”
continue = input(“continue?”) continue = input(“continue?”)
endwhile
DO…UNTIL (condition controlled) - post-check. Will run at least once
do
continue = input(“continue?”)
until continue == “N”
STRING MANIPULATION text = “Hello”
What it does PYTHON ERL Return: “Hello”
Count the number of characters in a len(text) text.length 5
string
Extract characters from a string text[1:5] [x:y]: text.substring[1:4] [x:y]: ello
x: first character x: first character
y: last (exclusive) y: number of characters incl x
Slice characters from left/right - text.left(2) / text.right(2) He / lo
Convert string to UPPERCASE text.upper() text.upper HELLO
Convert string to LOWERCASE text.lower() text.lower hello
Concatenate/Join strings + + -
Finds ASCII value of the character ord(“A”) ASC(A) 65
Finds the character corresponding to chr(65) CHR(65) A
the ASCII value
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