Flashcards
Pie
Cards in this deck (38)
- 1What do programs compose of1 - Modules
- 2What do modules contain1 - Statements
- 3What do statements contain1 - Expressions
2 - These create and process objects - 4What does Random.choice do1 - Given a list, will pick a random number from that list
2 - import random
random.choice([1,2,3,4]) - 5How do we do variables in pyth0n1 - Do not have to be declared
2 - Created when you assign it a value
counter = 100
name = "john"
name = [1.2.3,911] - 6How do we assign a single value to multiple variables1 - shez = shaz = paz = cunt
- 7How do we assign a variable of a string1 - s = Spam
Where the S in Spam is located at index 0
p = 1
a = 2
m = 3 - 8What is a negative index of a string1 - So given s = Spam
2 - You start at the right when using a negative index but start at 1
3 - So m = -1
A = -2
P = -3
M = -4 - 9What is string slicing1 - Where you slice parts of a string using the offsets.
2 - s = "Spam"
s[1:3] = 'pa'
s[1:] = 'pam' - 10What is Immutability1 - State cannot be changed once it has been initialized
2 - LOL ERLANGGGGGGG
3 - Strings are immutable in Pyth0n - 11How can we change characters in an existing string1 - S = 'Lancs'
s = 'Z' + S[1:]
s = Zancs - 12What does the .find operator dooo1 - Finds the first occurance and gets the offset value
2 - S = lancs
s.find(ancs)
=== 1 - 13What are leests1 - Like arrays but more powerf0l
2 - No data type
3 - No fixed size
3 - L = [item1, item2, item3]
4 - Results are usually lists instead of strings - 14What can we do with a list1 - L = [123, 456. 789]
L[1] =
[456]
2- L[:-1] - Anything but the last one
[123, 456] - 15How can we concatenate a leest1 - L + 222=
L = [123, 456, 789, 222] - 16How do we add and remove an element on a list1 - Use L.append(N1) to add to the end of a list
2 - L.pop(indexNumber) to remove an item at a specific index - 17What does the sort keyword do in a list1 - Sorts a list.
2 - L.sort = aa, bb, cc
3 - L.reverse = cc, bb, aa - 18You can also nest a list, how do dat1 - M = [[1,2,3], [4,5,6], [7,8,9]]
2 - M[1] --------- Get second one = [4,5,6]
3- M[1][2]-----go to second list, pick element 3 === 6 - 19What is list comprehension expression1 - Powerful way to process list structures
2 - Easy to grab rows by simple indexing because the matrix is stored in rows
M = [[1,2,3], [4,5,6], [7,8,9]]
Col2 = [row[1] for row in M] #Collects items in column 2
col2 = [2,5,8]. M IS UNCHANGED!!!!!! - 20How do we get and store user input1 - We have the input keyword
2 - name = INPUT (What ur name);
waits for input and stores it
print(name) - 21How we use if statements1 = if :
2 - HAVE TO USE INDENTATION. Indentation is part of condition. Otherwise it is not - 22What do for If else1 - If :
Else: - 23What is an ELIF1 - Allows program to choose from several possibilities in an if statement
If :
elif; - 24What do on a while lewp1 - while :
2 - REMEMBER TO INDENT!!!!!!! - 25What do on a FOR LEWP1 - for item in sequence:
EG
for count in [1,2,3]
for colour in [ red, blue, green] - 26What is the format for the range function in pyth0n1 - Range (start, end, step)
For i in range(0, 20, step) - 27What is a tuple1 - Like a list but in ()
2 - Is immutable
3 -Cant cahnge the length or subtiture elements like a list - 28Unpacking a tiple1 - If you know how many elements are in a tuple, you can assign each element a variable
Name, Score = ("Shez", 0)
Name = Shez
Score = 0 - 29When can we use tuples instead of lists1 - Used for constants
- 30What are dictionaries1 - Store information in key-value pairs
2 - {Key1: Value1, Key2:value2}
3 - Each key is sepeated from its value by a :. Items are seperated by ,
4 - Keys have to be unique - 31How can we use a key to retrieve a value1 - num ={1: 1, 2: 2, 3:3, 4:4}
2 - num["1"] returns 1.... - 32Testing a key to see if it has a value1 - if '1' in num:
print (num[1]
else:
print (key not found lmao) - 33Whats the split operation Dew1 - splits a string into a list of substring using delimters in the original string
s = aaa, bbb, cccc, ddd
s.split = ['aaa','bbb,....] - 34Python program to count the number of werds and chars in the sentecesentence = “The quick brown fox jumps over the lazy dog ”
words = sentence.split()
print("\nWords = ", words)
print("Word count = ", len(words)) - 35What are function1 - Allow you break up big program to smaller managable chunks of code
2 - Start a function by called def - 36What are global variables and constants in Python1 - Way of sharing data across all parts of the program using globals variables
- 37How we handle exceptions1 - WIth the try and except clause
try:
except - 38—
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- Flashcards on Pie, created by Shez F on 16/05/2017.
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- Shez F
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