Functions
Function with varied number of arguments
*args:
- Variable number of arguments.
- Can be used in function arguments
import sys
def addition(*args):
result = 0
for arg in args:
result = result + arg
return result
if __name__ == '__main__':
print("Inside main")
print(addition(1))
print(addition())
print(addition(1,2))
print(addition(1,2,3,4,5,6,7,8,9))
* Exercise: Write a python function which takes variable number of arguments and finds out the largest number of it.
# Sample Outputs
max(1,2,10,1,100) = 100
max(100) => 100
max() => -1
def max(*args):
if len(args) == 0:
result = -1
else:
result = args[0]
for arg in args:
if arg > result:
result = arg
return result
* Exercise: Write a min function with variable arguments
# Sample Outputs
min() => -1
min(10,5) => 5
min(10) => 10
**kwargs: This is also a variable set of arguments, they are called as keyworded arguments
def printargs(**kwargs):
for key, value in kwargs.items():
print(key+"==>"+value)
pass
if __name__ == '__main__':
print("Inside main")
printargs(first = '1', sec= '2')
printargs(a = '1', b= '2')
Python Lists, Tuples and Dictionaries.
Lists:
- Mutable collection of objects.
# open terminal or powershell and enter python to enter python shell
x = [1,2,4,8,16]
type(x)
# print 1st element index will be 0
x[0]
# finding length of list
len(x)
# to insert element
x.append(32)
# to remove element
x.remove(1)
# to update element
x[0]=1
# slicing can be done
x[::-1]
Tuples:
- Immuatable collection of objects
- Syntax is <variable> = (1,2,3)
y = (1,2,3)
type(y)
y[0] # 1
y[0] = 5 # error => exception
y.append # error
y.remove # error
Dictionary
- Is collection of key value pairs
z = {'course': 'python', 'applicable': ['AWS', 'AZURE', 'DEVOPS']}
type(z)
# insert a new key pair
z['inst'] = 'QualityThought'
# To find if key exists
#key in <varibale>
'course' in z
Iterating files and directories
