Reference : https://realpython.com/products/python-tricks-book/?utm_source=drip&utm_medium=email&utm_campaign=pytricks-is-vs # "is" vs "==" >>> a = [1, 2, 3] >>> b = a >>> a is b True >>> a == b True >>> c = list(a) >>> a == c True >>> a is c False # • "is" expressions evaluate to True if two # variables point to the same object # • "==" evaluates to True if the objects # referred to by the variables are equal
args & kwargs – python
Reference : https://realpython.com/products/python-tricks-book/?utm_source=drip&utm_medium=email&utm_campaign=Python+Tricks&utm_content=%5B%F0%9F%90%8DPyTricks%5D%3A+Function+argument+unpacking+in+Python
Difference of args & **kwargs,
def myfunc(x, y, z):
print(x, y, z)
args = (1, 0, 1)
kwargs = {'x': 1, 'y': 0, 'z': 1}
>>> myfunc(*args)
1, 0, 1
>>> myfunc(**kwargs)
1, 0, 1
Decorators – Python
Decorators – One function takes argument as an another one function,
def test_dec(func):
def test1(ip):
ts = sum(ip)
for x in range(len(ip)):
yield ts-ip[x]
return test1
@test_dec
def test2(ip):
return ip
a = list(test2([1,2,3,4,5]))
print (a)
print (min(a)) #10
print (a)
print (max(a)) #14
Yield in Python
Yield – Instead of return can use this, It returns as a generator object, Mainly designed for memory consumption
ip = [1,2,3,4,5]
def test(ip):
ts = sum(ip)
for x in range(len(ip)):
yield ts-ip[x]
print (min(test(ip))) #10
print (max(test(ip))) #14
Python Range & XRange
Find Second Largest Number
print (' ************* To Find Second Largest Number *************** ')
num_count = input('Enter Numbers Count : ')
if (num_count > 1):
range_val = range(1,int(num_count)+1)
numlist = []
for n in range_val:
n_temp = str(n)+("th" if 4<=n%100<=20 else {1:"st",2:"nd",3:"rd"}.get(n%10, "th"))
num = input('Enter '+n_temp+' integer : ')
numlist.append(num)
numlist = list(set(numlist))
numlist.sort(reverse=True)
print ('Second Largest Number : '+str(numlist[1]))
else:
print ('You Should Enter More Than Two Integers')
OUTPUT
************* To Find Second Largest Number ***************
Enter Numbers Count : 5
Enter 1st integer : 1
Enter 2nd integer : 2
Enter 3rd integer : 3
Enter 4th integer : 4
Enter 5th integer : 4
Second Largest Number : 3
Python – Hamming Distance
Hamming Distance – Returns count of difference characters between same length of two strings
# TO FIND HAMMING DISTANCE
def hamming_distance(a1, a2):
if len(a1) == len(a2):
diff = [a1_c for a1_c,a2_c in zip(a1,a2) if a1_c != a2_c]
print (diff)
distance_res = len(diff)
else:
distance_res = False
return distance_res
a1 = str(input('Enter 1st String : '))
a2 = str(input('Enter 2nd String : '))
print hamming_distance(a1, a2)
PYTHON – PRIME NUMBER GENERATOR
>>> for x in range(2,10): ... y = 2 ... cnt = 0 ... while y < x: ... if x % y == 0: ... cnt = 1 ... y = y+1 ... else: ... y = y+1 ... if cnt == 0: ... print (str(x)+' prime') 2 prime 3 prime 5 prime 7 prime >>>
PYTHON LIST – HOW LIST REVERSE – LOGIC WORKS ?
L1 = [1,2,3,4,5,6,7,8,9,0]
L2 = L1[-1:-11:-1]
L4 = L1[::-1]
# L2 = L1[ start : (list_count+1) : diff ]
print (L2)
print (L4)
L3 = []
for v in range(-1,-11,-1):
L3.append(L1[v])
print (L3)
if (L2 == L3 == L4):
print (True)
else:
print (False)
RESULT:
[0, 9, 8, 7, 6, 5, 4, 3, 2, 1]
[0, 9, 8, 7, 6, 5, 4, 3, 2, 1]
[0, 9, 8, 7, 6, 5, 4, 3, 2, 1]
True
PYTHON – HANDLE TWO LISTS IN SINGLE LOOP
N = int(input())
# Get the array
numArray1 = list(map(int, input().split()))
numArray2 = list(map(int, input().split()))
sumArray = []
def addval(a,b):
return a+b
# Write the logic here:
sumArray = [sum(x) for x in zip(numArray1, numArray2)]
# Print the sumArray
for element in sumArray:
print(element, end=” “)
print(“”)
OUTPUT:
Input:
N = 3
numArrayA = 3 9 8
numArrayB = 8 12 74
Output:
11 21 82
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