7/1/22, 4:51 PM Day5 - Jupyter Notebook

Functions and Data Structures

continue with strings
function
Introduction to Data Structures

working with strings

str methods
methods can be applied on only strings
dir(str)

In [1]:

1 dir(str)

Out[1]:

['__add__',
'__class__',
'__contains__',
'__delattr__',
'__dir__',
'__doc__',
'__eq__',
'__format__',
'__ge__',
'__getattribute__',
'__getitem__',
'__getnewargs__',
'__gt__',
'__hash__',
'__init__',
'__init_subclass__',
'__iter__',
' le ',

In [10]:

1 name="ruthu"
2 name

Out[10]:

'ruthu'

In [3]:

1 name+"vanitha"

Out[3]:

'ruthuvanitha'

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In [4]:

1 name

Out[4]:

'ruthu'

In [5]:

1 name+="vanitha"

In [6]:

1 name

Out[6]:

'ruthuvanitha'

string methods

str.capitalize()
which capatilizes the first char of str
str.isalpha()
str.isdigit()
isnumeric()
islower()
isupper()
lower()
upper()
title()
startswith()
endswith()
count()
index()
replace()
strip()
lstrip()
rstrip()
split()
center()
format() etc..

In [19]:

1 st=input("enter the string:")

2 st

...

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In [25]:

1 st.isupper()

Out[25]:

False

In [20]:

1 st.isalpha() # checks the str whether it is lower or not

...

In [21]:

1 st.isnumeric() # integer possibility of str

...

In [22]:

1 st.islower() # lower case

...

In [23]:

1 name

...

In [24]:

1 name.islower()

...

In [14]:

1 st

...

In [15]:

1 st.capitalize() #

...

In [17]:

1 st=st.capitalize()
2 st

Out[17]:

'Nandini'

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In [18]:

1 st.isalpha()

Out[18]:

True

In [27]:

1 st.lower()

Out[27]:

'student@123'

In [28]:

1 name.islower()

Out[28]:

True

In [29]:

1 name.upper()

Out[29]:

'RUTHU'

In [34]:

1 new=st.center(40)
2 # centrailse the string with given value of places/bits

In [35]:

1 new

Out[35]:

' Student@123 '

In [36]:

1 len(new)

Out[36]:

40

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In [37]:

1 new.lstrip()

Out[37]:

'Student@123 '

In [38]:

1 new.rstrip()

Out[38]:

' Student@123'

In [39]:

1 new.strip()

Out[39]:

'Student@123'

In [42]:

1 # format or fstring
2 "I am {0} and from {1}".format('Ruthu','Apssdc')

Out[42]:

'I am Ruthu and from Apssdc'

In [48]:

1 # format or fstring
2 name,org=input(),input()
3 details="I am {0} and from {1}".format(name,org)

Vanitha
APSSDC

In [49]:

1 details

Out[49]:

'I am Vanitha and from APSSDC'

In [50]:

1 details.count('a') #

Out[50]:

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In [51]:

1 details.title()

...

In [52]:

1 details.split() # list of words

...

In [53]:

1 details.swapcase()

...

In [54]:

1 details.index('and')

...

In [55]:

1 details.index('a') # gives you the first occurence

Out[55]:

In [56]:

1 details

...

In [57]:

1 # replace(old,new)
2 details.replace('and','new')

...

In [58]:

1 details.strip()

...

In [61]:

1 details.endswith('C')

Out[61]:

True

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In [62]:

1 details.startswith('I')

Out[62]:

True

In [67]:

1 # read a str from user and

2 # print vowels present in it
3 st=input()
4 vowels="aeiouAEIOU"
5 print("lowercase vowels ",end=":")
6 for ch in st:
7 if ch in vowels:
8 if ch.islower():
9 print(ch,end=" ")
10
11 print("\nupper case vowels",end=":")
12 for ch in st:
13 if ch in vowels:
14 if ch.isupper():
15 print(ch,end=" ")

...

In [68]:

1 # find the frequency of sub string

2 # read n space separated integers from user
3

In [87]:

1 sub="vrsec"
2 clg=input("string:")
3 count=0
4 for word in clg:
5 if word==sub:
6 count+=1
7 print("frequency=",count)

string:vrsec in vijayawada vrsec working for student skill improvement vrsec

good at placements
frequency= 0

In [88]:

1 len(clg)

Out[88]:

88

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In [79]:

1 clg[3]
2

Out[79]:

'e'

In [80]:

1 clg[0]

Out[80]:

'v'

In [89]:

1 sub="vrsec"
2 clg=input("string:").split()
3 count=0
4 for word in clg:
5 if word==sub:
6 count+=1
7 print("frequency=",count)

string:vrsec in vijayawada vrsec working for student skill improvement vrsec

good at placements
frequency= 3

In [83]:

1 clg[0]

Out[83]:

'vrsec'

In [90]:

1 len(clg)

Out[90]:

13

In [91]:

1 print(clg)

...

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In [92]:

1 # read n space separated values from user

2 # find the sum of middle digits in it
3 # n=7
4 #908 765 345 123 904 567
5 #

In [100]:

1 n=int(input("number:"))
2 nums=input().split()[:n]
3 s=0
4 for num in nums:
5 s+=int(num[1])
6 print("sum of middle digits:",s)

...

In [97]:

1 clg[:6]

...

Functions

a block of statements executed to perform a perticular task

reusability of code
modularity of code
2types of functions
1. pre-defined and
these were defined when the language is developed
we simply call and use them
print(),len(),type(),input(),bin(),ord(),chr(),int(),dir(),str() etc.
2. user defined
defined by user
in 4 many ways
syntax
def function_name(args):
statements
return
function definition and
arguments,dummy variables
the main logic
function call
using the defined function
parameters / actual values

In [101]:

1 print("sdhfkdfkdfkj")

sdhfkdfkdfkj

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In [102]:

1 len("erutuue")

Out[102]:

function definition

function with args and with return

func with args and without return
func without args and with return
fun without args and without return

In [103]:

1 # function that adds three values

2 def add(a,b,c):
3 return a+b+c
4 # function definition
5
6 add(9,3,4)

Out[103]:

16

In [104]:

1 def product(x,y):
2 print("product=",x*y)
3
4 x,y=int(input()),int(input())
5 product(x,y)

9
45
product= 405

In [105]:

1 # 3rd fun without args and with return

2 st=input("string:")
3 ch=input("char:")
4 def frequency():
5 return st.count(ch)
6
7 frequency()

string:Ruthu from APSSDC upersdf user

char:u

Out[105]:

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In [110]:

1 #4th type
2 def message():
3 msg=input("message:") # local
4 print("hello my dear",msg)
5 message()

message:enemy
hello my dear enemy

In [107]:

1 msg

...

In [108]:

1 x

Out[108]:

In [109]:

1 y

Out[109]:

45

In [ ]:

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