Python:Accumulate with Various Operations

Accumulator Tutorials

Adding and Counting

Two Accumulators

Checking an Array

Building Strings

Using a file

Multiple Variables

Searching for Values

Harder Examples

Reprise

Using an Accumulator

Concatenate

Concatenate the string array

Concatenate means stick the strings together.

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def f(list): acc = 0 for v in list: acc = acc+1 return acc

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test text

 

 

 

 

List it

Put commas in front of each element.

Change the line to

acc = acc+","+v;

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def f(list): acc = 0 for v in list: acc = acc+1 return acc

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test text

 

 

 

 

Concatenate with brackets

Concatenate the string array - put angle brackets around each item:

 f({"a","b","c","d"})  -> <a><b><c><d>
 f({"x","y"})          -> <x><y>
 f({"yes","but","no"}) -> <yes><but><no>

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def f(list): acc = 0 for v in list: acc = acc+1 return acc

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test text

 

 

 

 

Reverse Concatenate

Concatenate the string array, backwards

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def f(list): acc = 0 for v in list: acc = acc+1 return acc

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test text

 

 

 

 

Front and back

Palindrome it

f({"a","b","c","d"}) ->dcbaabcd                 
f({"x","y"})         ->yxxy                     
f({"yes","but","no"})->nobutyesyesbutno  

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def f(list): acc = 0 for v in list: acc = acc+1 return acc

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test text

 

 

 

 

List it nicely

Put commas between the elements of the string array

• Notice that the separator sep has is "=" for the first iteration, therafter it will always be "#".
• The "-" is added in the return statement.
• Replace "=", "#" and "-" with appropriate strings.

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def f(list): sep = "=" acc = "" for v in list: acc = acc+sep+v return acc+"$"

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test text

 

 

 

 

Accumulator Tutorials

Adding and Counting

Two Accumulators

Checking an Array

Building Strings

Using a file

Multiple Variables

Searching for Values

Harder Examples

Reprise