Python day-Dictionary, Frequency of character using nested loops

Dictionary-{}

--> Dictionaries are used to store data values in key:value pairs.
--> A dictionary is a collection which is ordered, changeable and do not allow duplicates.
-->In dictionary each element can be accessed by their keys, not through indexing.
-->If dictionary does not contain the key then the output will be 'KeyError'.

Example:

thisdict = {
  "brand": "Ford",
  "model": "Mustang",
  "year": 1964
}

student = {"name":"raja", "class":5}

print(thisdict)
print(student)

Output:

{'brand': 'Ford', 'model': 'Mustang', 'year': 1964}
{'name': 'raja', 'class': 5}

Exercises:Find characters in a string using Nested loops
1. Finding frequency of each letter in a string

s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name print j>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">g 1
u 2
r 2
p 1
a 3
s 1
n 2

*2. Letters appeared Only Once *

s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and print j>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">g 1
p 1
s 1

3. Most frequent letter

s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and print j>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">u 2
r 2
a 3
n 2

4. First Non-repeated letter

s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and print break j>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">g 1

5. First repeated letter

s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and print break j>



<p><strong>6. Last non-repeated letter</strong><br>
</p>

<pre class="brush:php;toolbar:false">last = ' '
last_count = 0 
s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and last="key" last_count="count" j print>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">s 1

7. Last repeated letter

last = ' '
last_count = 0 
s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" count="1" i="j+1" if while name and last="key" last_count="count" j print>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">n 2

8. Most Frequent letter

s = 'guruprasanna'
name = list(s)
j = 0 
last = ' '
last_count = 0 

while j<len key="name[j]" count="1" i="j+1" if while name and>last_count:
            last = key
            last_count = count
    j+=1

print(last, last_count)
</len>

9. Frequency of Vowels (a,e,i,o,u)

vowels = ['a','e','i','o','u']
last = ' '
last_count = 0 
s = 'guruprasanna'
name = list(s)
j = 0 
while j<len key="name[j]" if in vowels: count="1" i="j+1" while name print j>



<p>Output:<br>
</p>

<pre class="brush:php;toolbar:false">u 2
a 3

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