Section 1
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import math
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Last updated
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Date created
Mar 14, 2020
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Section 1
(50 cards)
import math
To use many mathematical functions, you'd first use this statement
i in range(1,11)
This complete line would execute something below with values of i in inclusive range 1-10
:
The end of the first line of a new function definition should be this.
f.write("hello")
To output the word hello to an opened text file variable called f, use this.
(x,y=10)
This would be after a new function's name if it took 2 parameters called x and y and y had a default value of 10.
l1 + l2
This expression will return a new list, joining l1 and l2 in order.
list(range(2,9,2))
To create the list [2,4,6,8] without [] and with a single statement use this expression.
else:
If a test is not satisfied and something else should happen when that occurs, it begins with this.
They're all indented the same amount
To do more than one thing based on a conditional test, they must have this property
=
This operator is used to store a value in a variable
l.sort()
This statement will change a list of numbers called l so that its contents are reordered from smallest to largest.
log10
The function that would return 3.0 if called with 1000 as its parameter is this.
[1, 2, 3]
This is how you write a list of whole numbers 1 through 3 in order.
while
to keep executing something if a test is true, use this keyword
s.isdigit()
This expression returns whether all the characters in a string called s are numbers (0-9).
float
this type stores a number with decimals
The exponent of e that the parameter is
The log function returns this
i in l
To check whether an item i is in a list called l without using indexing, use this expression.
l = s.split()
This statement puts all substrings in a string called s separated by spaces in a list called l.
s.upper()
This expression returns a modification of a string called s where all characters are capitalized.
f.close()
To make sure a text file variable called f that you've sent info to can be opened for reading, use this.
if __name__ == "__main__":f()
To define what the "main" function is, called f, without calling it, use this.
l = f.readline() akd
This statement will put the next unread line in an opened text file variable called f into a variable called l.
for n in l:
To do something for each number n in a list called l without using indexing, start with this expression.
Return
This keyword is used to give back a value to the place that calls a function.
print("%-12s%6d" % ("Mary",21))?
This expression outputs Mary left-aligned in 12 characters followed by 21 right-aligned in 6 characters.
Bool (boolean)
To do something conditionally, there must be an expression or value of this type
def
This keyword is used to create a new function.
2
The expression "abcdef".find("cd") returns this.
break
this keyword can be used to terminate a loop without changing the condition it keeps checking
for
to do something a fixed number of times without using separate statements, this keyword is the most appropriate.
Input
This function takes a prompt and returns the string of characters the user entered
s = ",".join(l)
This statement creates a string called s by joining a list of strings called l and separates them with a comma.
float
To convert a string of characters that a user entered, to a number that might have decimals use this function
i in range(99,0,-2)
this complete line would execute something below with odd values of i in decreasing order from 99 to 1.
//
This operator returns how many times the number on the right goes in completely into the number on the left.
s = f.read()
This statement will put everything in an opened text file variable called f into a string variable s.
if
This keyword is used before a test to determine whether something should be executed
==
This operator checks whether two values are the same
randint(1,6)
To simulate rolling a die, use this expression
l[2]
This expression will return the 3rd item in a list called l.
for item in l:
To do something for each item in a list called l without using indexing start with this line.
This function is used to output something.
float
When two whole numbers are divided with /, the result has this type
elif
To choose from more than two alternatives, ones that aren't first or last begin with this keyword
str
This type stores a sequence of characters
int
This type stores a number without decimals
len(s)
This expression returns how many characters are in a string called s.
random.randrange(1,9,2)
Without importing the specific function, use this expression to create a positive 1-digit random odd number
f = open("names.txt","r")
Before reading from a text file variable called f that should be used to read from names.txt, use this statement.
Section 2
(1 card)