Python Cheat Sheet Page 2
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1
2
3x not in s
if item x is not found in item s returns True
s[i]
returns item in position i of s
s[i:j]
returns slice of s from position i, up to but not including position j
s[i:j:k]
returns slice of s as above, in steps of k
s.count(x)
returns number of instances of x in s
s[i] = x
item i in s is replaced with x
s[i:j] = t
items in range i to j of s are replaced with t (t must be same
length
as slice)
del s[i:j]
delete items in s range i to j
s.append(x)
appends x to the end of s
s.clear()
removes all instances from s
s.insert(i,x)
inserts x into s at position i
s.pop()
removes item from s
s.remove()
removes the first instance in s
Lists
list[ ]
create new empty list
list[1,2,3]
create list populated with 1, 2 & 3
Strings
str.capitalize()
returns string with first letter capitalised
str.join(x,y,z)
returns concatenation of strings x, y & z
str.lower()
returns the string in lowercase
str.upper()
returns the string in uppercase
str.lstrip()
returns string with leading input removed
str.rstrip()
returns string with trailing input removed
str.strip()
returns string with all input removed
Dictionaries
dict()
creates new empty dictionary
dict(‘one’:1, ‘two:2’)
creates new populated dictionary including ‘key’:value
d[key]
returns value for key in d
d[key] = value
sets value for key in d
del d[key]
removes value for key in d
key in d
returns True if key found in d
key not in d
returns True if key not found in d
clear()
remove all items from dictionary
get(key)
return value for key
Loops
for i in x
loops through items in x
if
action if returns True, if False continue to elif or else
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