Python Cheat sheet

Numeric types
N = int(24) or Integer = 24
N = float(1.5) or float = 1.5
Complex = complex('A1') or  a = 1j

Text type
String = "A" or N =str('Majid')

Sequence Types
List
L1 = ['A','B','C']
L1 = list(('A','B','C'))

Tuple
T1 = ("A", "B", "C")
T1 = tuple(("A", "B", "C"))

Range
R1 = range(6)

Mapping Type
Dictionary
D1 = {"name" : "Majid", "O" : 36}
D2 = dict(name="Majid", O=36)

Set Types
set
S1 = {"A", "B", "C"}
S2 = set(("A", "B", "C"))

frozenset
FS1 = {"A", "B", "C"}
FS2 = frozenset(("A", "B", "C"))

Boolean Type
B1 = True
B2 = False

x = int(x)
x = str(x)
x = float(x)

Python Booleans
if b > a
if myFunction()

Tuple
T1 = ("a","b","c")
T2 = tuple(("a","b","c"))

Access Tuple Items

Update and change
T1 = list(T1)
T1.append("d")
print(tuple(T1))

add to tuple
T1 += "E"

Loop Through a Tuple
for x in thistuple:
  print(x)

for i in range(len(thistuple)):
  print(thistuple[i])

Join:
TF = T1 + T2

S1 = {"A","B","C"}
S2 = set(("A","B","C"))

Add/Remove Set Items
S1.add("E")
S1.update(S2)
S1.remove("E")
S2.discard("E")
S1.pop("E")
S2.clear()

Join Two Sets
S1.union(S2)

Duplicates
S1.intersection(S2)

Python while Loop:
i = 0
while i < 6:
  i += 1
  if i == 3:
    continue
  print(i)

Python for loop:
L = ["A", "B", "C"]
for x in L:
    print(x)
    
for x in range(6):

function lambda:
num = lambda a,b : a + b
print(num(4,3))

#dictionary:
D1 = {'name':'Majid',"Age":26}
print(type(D1))

#Get Access:
x = D1.values()
y = D1.keys()

#Check:
if "name" in D1:

#Update Dictionary
D1.update({"name": 'Reza'})

#Removing Items
D1.pop("name")
del D1["name"]
D1.clear()

#Loop
for x in D1:
  print(D1[x])

for x, y in D1.items():
  print(x, y)

#Copy
D2 = dict(D1)
print(D2)

#Nested
D1 = {
    "S1":{
        "name":"Majid",
        "Age" : 25
    },
    "S2":{
        "name":"Reza",
        "Age" : 30
    }
}
print(D1)
for x in range(len(D1)):
    n = 'S'+str(x+1)
    print(D1[n]['name'])

Python Casting

Strings are Arrays
M = "Majid"
print(M[1])

Looping Through a String
for x in "Majid":
  print(x)

String Length
print(len(x))

Check String
print("free" in txt)

Check if NOT
print("expensive" not in txt)

Other
print(b[2:5])
print(b[-5:-2])
print(a.upper())
print(a.lower())
print(a.strip())
print(a.replace("H", "J"))
print(a.split(","))
capitalize()
count("apple", 10, 24)
find("e", 5, 10)

String Concatenation
print(a+b)

String Format
A = 10
F = " Num is {}"
print(F.format(A))

A = 20
B = 30
C = 40
F = "The mess is {1} and {2} and {0}"
print(F.format(A,B,C))

Escape Characters
\\     Backslash
\n     New Line
\t     Tab

L1 = ["A", "B", "C"]
print(L1[1])
print(L1[-1])
print(L1[:1])
print(L1[1:])
print(L1[-4:-1])

Check if Item Exists
if "A" in L1

Change List Items
L1[1] = "D"

Change a Range of Item Values
L1[1:3] = ["E", "F"]

Insert Items
L1.insert(2, "G")

Append Items
L1.append("H")

Extend List
L4 = ["1", "2", "3"]
L5 = ["4", "5", "6"]
L4.extend(L5)

Remove Specified Item
L1.remove("A")

Remove Specified Index
L1.pop(1)
del L1[0]

Loop Through a List
for x in L1:
  print(x)

for i in range(len(L1)):
  print(L1[i])

while i < len(L1):
  print(L1[i])
  i = i + 1

List Comprehension
L2 = ["Asd", "Bsd", "Csd", "Dsd", "er"]
LF = []
for x in L2:
  if "a" in x:
    LF.append(x)
print(LF)

Sort Lists
L1.sort()
L1.sort(reverse = True)

Join Lists
L3 = L1 + L2
L1.extend(L2)

if(2 > 1):
    print('OK')

Python Functions
def A():
  print("OK")

def B(*H):
  print("Nums is " + H[2])
B("1", "2", "3")

def C(country = "Norway"):
  print("I am from " + country)
C("Sweden")
C("India")
C()

def D(x):
  return 5 * x

Arrays
A = ["1", "2", "3"]

Modify:
A[0] = "0"

Removing Array Elements
A.pop(1)
A.remove("Volvo")

Add Array Elements
A.append("4")
A.insert(1, "5")