Python – Strings
- Access characters in string by index
- Check if a string contains a sub string
- Iterate over the characters in string
- Find occurrence a sub-string in string
- Compare strings in Python
- Replace characters in a string
- Remove characters from a string by Index
- Check the first or last character of a string
- Find frequency of each character in string
- Count occurrences of a characters in string
- How to pad strings in Python ?
- Create multi line string objects in python
- How to get first N characters in a string
- How to get Last N characters in a string
Python File Handling
- Read a file line by line in Python
- Open a file using “open with” statement
- Search for strings in a file
- Remove a file if exists and handle errors
- Three ways to check if a file is empty
- Get Last Modification date & time of a file
- Get Last Access & Creation time of a file
- Append text or lines to a file in the end
- Get file size in KB, MB or GB in python
- How to delete specific lines in a file
- Add a column to an existing CSV file
- How to append a new row to a CSV file?
- Get last N lines of a text file, like tail cmd
- How to insert lines at the top of a file?
- Read CSV into a list of lists or tuples or dict
- Read a file in reverse order line by line
Python – Lists
- Create & initialize list in python
- Add / append an element in list
- Find all indexes of an item in a List
- Get number of elements in a list
- Check if list contains duplicates
- Count elements by condition
- Remove element by value or Index
- Remove multiple elements from list
- Convert nested lists to a flat list
- Find duplicates in a list
- Read More
Python Tuples
Python Dictionary
- Introduction to Dictionaries
- Creating Dictionaries in Python
- Iterating over dictionaries
- Check if a key exists in dictionary
- Get all the keys in Dictionary
- Get all the Values in a Dictionary
- Remove a key from Dictionary
- Add key/value pairs in Dictionary
- Find keys by value in Dictionary
- Filter a dictionary by conditions
- Print dictionary line by line
- Convert a list to dictionary
- Sort a Dictionary by key or Value
- Dictionary: Shallow vs Deep Copy
- Remove keys while Iterating
- Get all keys with maximum value
- Merge two or more dictionaries
Directories in Python
- Create a Directory in python
- Check if a file or directory exist
- Check if a directory is empty
- Get list of files in a directory
- Delete a directory recursively
- Move files and Directories
- Get List of all empty Directories
- Get the current working directory
- Change current working directory
- Remove files by pattern or wildcards
- Copy files to a directory to other
- Move files and directories in python
Python Date Time
Python Iterators & Generators
Threads in Python
Python Process Management
Data Analysis with Python
Dataframe in Python Pandas
- How to create DataFrame from dictionary?
- Create an empty DataFrame and add data later
- How to convert lists to a dataframe?
- Read csv file to Dataframe with custom delimiter
- Select Rows in DataFrame by conditions on columns
- Select Rows & Columns by Name or Index in DataFrame
- Add rows in a DataFrame | append vs loc vs iloc
- How to add new columns in a DataFrame?
- Find indexes of an element in pandas dataframe
- Dataframe head() & tail() tutorial
- Apply a function to columns or rows in Dataframe
- Drop rows from a dataframe with NaN
- Read More
Numpy Arrays in Python
- Create a numpy array from list, tuple or list of lists
- How to add elements at the end of a Numpy Array
- How to sort a Numpy Array in Python?
- How to save a Numpy Array to a csv file?
- How to Reverse a 1D & 2D numpy array in python?
- Sorting 2D Numpy Array by column or row
- Select elements by conditions from Numpy Array
- Select rows / columns by index from a Numpy Array
- Select an sub array by index from a Numpy Array
- Delete elements from a Numpy Array
- numpy.where() Tutorial & Examples
- Read More
C++11 Miscellaneous Topics
Best C++11 / C++14 Courses & Books
Design Patterns
C++ Interview Questions
- Variable Arguments
- Verify brackets or parentheses combination
- Convert the base of a Number to any other base in Number System
- Fibonacci Sequence without Recursion
- Use OOPS to Display a sequence of numbers without any For-Loop or Recursion
- Allocating and deallocating 2D arrays dynamically in C and C++
- What’s std::vector and why should I use std::vector?
- How does std::vector works internally ?
- What is std::deque and how deque works internally.
Data Struture
gdb
Polymorphism
Method Overriding in Java
STL – Map Tutorial
- 1.) std::map Usage Detail with examples
- 2.) std::map and Comparator
- 3.) std::map & User defined class objects as keys
- 4.) Set vs Map
- 5.) How to Iterate over a map in C++
- 6.) Map Insert Example
- 7.) Iterate a map in reverse order
- 8.) Check if a key exists in a Map
- 9.) Search by value in a Map
- 10.) Erase by Key | Iterators
- 11.) C++ Map : Operator []
- 12.) Erase by Value or callback
- 13.) copy all Values from a Map to vector
C++11 Multithreading
- Part 1: Three Ways to Create Threads
- Part 2: Joining and Detaching Threads
- Part 3: Passing Arguments to Threads
- Part 4 : Sharing Data & Race Conditions
- Part 5 : Fixing Race Conditions using mutex
- Part 6 : Need of Event Handling
- Part 7: Condition Variables
- Part 8: std::future and std::promise
- Part 9: std::async Tutorial & Example
- Part 10: std::packaged_task<> Tutorial
C++11 Smart Pointers
C++11 Unordered Map
C++11 Unordered Set
Callbacks in C++11
C++11 Rvalue References
STL – Vector Tutorial
- 1.) What’s std::vector and why to use it?
- 2.) Different ways to initialize a vector
- 3.) How does std::vector works internally
- 4.) User Defined Objects & std::vector
- 5.) How to use vector efficiently in C++?
- 6.) std::vector and Iterator Invalidation
- 7.) Remove repeated elements from a vector
- 8.) Fill a vector with random numbers
- 9.) Hidden cost of std::vector
- 10.) Adding elements in Vector
STL – List Tutorial
- 1.) std::list Internals & Usage Details
- 2.) List vs Vector
- 3.) Different ways to Initialize a list
- 4.) Erase elements using iterators
- 5.) Remove elements while Iterating
- 6.) Remove elements based on External Criterion
- 7.) Get element by index in List
- 8.) Searching an element in std::list
- 9.) Different Ways to iterate over a List
- 10.) Sorting a List & custom Comparator
STL – Deque
STL – Set Tutorial
- 1.) C++ Set basic example and Tutorial
- 2.) Using std::set with user defined classes
- 3.) std::set and external Sorting criteria | Comparator
- 4.) Access Element by index in Set
- 5.) How to insert elements in Set
- 6.) How to iterate over a Set
- 7.) Removing an element from Set
- 8.) Erase elements while Iterating & Generic erase_if()
STL – MultiMap Tutorial
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