Python Numpy Tutorials
- Create a numpy array from list, tuple or list of lists
- Find the index of value in Numpy Array
- Select element or sub array by index from numpy array
- Select rows / columns by index from a 2D numpy array
- Select elements by conditions from Numpy Array
- Create a Numpy Array of evenly spaced numbers
- How to append elements to a Numpy Array
- Find max value & it’s index in Numpy Array | numpy.amax()
- Find unique values in a numpy array with frequency & indices
- numpy.where() : Tutorial & Examples | Python
- numpy.zeros() & numpy.ones() | Create a numpy array of zeros or ones
- Create Numpy Array of different shapes & initialize with identical values using numpy.full()
- numpy.amin() | Find minimum value in Numpy Array and it’s index
- numpy.linspace() | Create same sized samples over an interval in Python
- Delete elements, rows or columns from a Numpy Array by index positions using numpy.delete() in Python
- How to get Numpy Array Dimensions using numpy.ndarray.shape & numpy.ndarray.size() in Python
- Sorting 2D Numpy Array by column or row in Python
- How to Reverse a 1D & 2D numpy array using np.flip() and [] operator in Python
- How to save Numpy Array to a CSV File using numpy.savetxt() in Python
- What is a Structured Numpy Array and how to create and sort it in Python?
- How to sort a Numpy Array in Python ?
Python Pandas Tutorials
- Create DataFrame from dictionary in pandas
- Get list of column and row names in DataFrame
- Change Column & Row names in DataFrame
- Select Rows & Columns using loc & iloc in DataFrame
- Select Rows based on conditions
- Drop rows in DataFrame by index labels
- Drop rows in DataFrame by conditions on column values
- Drop columns in DataFrame by label Names or Position
- Add new columns in a dataFrame
- How to add rows in a DataFrame
- Count NaN or missing values in DataFrame
- Convert lists to a dataframe
- Find & Drop duplicate columns in a DataFrame
- Create an empty DataFrame and add data to it later
- Pandas : Check if a DataFrame is empty in Python
- Pandas : Find duplicate rows in a Dataframe based on all or selected columns using DataFrame.duplicated() in Python
- Pandas : skip rows while reading csv file to a Dataframe using read_csv() in Python
- pandas.apply(): Apply a function to each row/column in Dataframe
- Pandas: Sort rows or columns in Dataframe based on values using Dataframe.sort_values()
- Pandas: Find maximum values & position in columns or rows of a Dataframe
- Pandas : How to Merge Dataframes using Dataframe.merge() in Python – Part 1
- Pandas : Merge Dataframes on specific columns or on index in Python – Part 2
- Pandas : How to merge Dataframes by index using Dataframe.merge() – Part 3
- Pandas : count rows in a dataframe | all or those only that satisfy a condition
- Pandas : Read csv file to Dataframe with custom delimiter in Python
- Pandas : 6 Different ways to iterate over rows in a Dataframe & Update while iterating row by row
- Pandas : Loop or Iterate over all or certain columns of a dataframe
- Get minimum values in rows or columns & their index position in Dataframe using Python
- Apply a function to single or selected columns or rows in Dataframe
- Sort a DataFrame based on column names or row index labels using Dataframe.sort_index() in Pandas
- Pandas : Drop rows from a dataframe with missing values or NaN in columns
- Get unique values in columns of a Dataframe in Python
- Change data type of single or multiple columns of Dataframe in Python
- Check if a value exists in a DataFrame using in & not in operator | isin()
- Select first or last N rows in a Dataframe using head() & tail()
- How to display full Dataframe i.e. print all rows & columns without truncation
- Find indexes of an element in pandas dataframe
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Python List
- Check if an item exists in List
- Check if a list contains all the elements of other list
- Create a List and initialize with values
- How to Iterate over a List
- Insert an element at specific index in List
- Sort a list of tuples by 2nd Item
- Sort a list of strings
- Add an element in list | append() vs extend()
- Check if all elements in a List are same
- Merge / Join two or more lists
- How to find all indexes of an item in a List ?
- Count elements in a list, lists of lists or nested list
- Remove Duplicates from a List
- Convert a list to string
- Remove element from a list by value or Index
- Remove multiple elements from list
- Convert list of lists or nested list to flat list
- Count elements in a list that satisfy certain conditions
- Python : 3 ways to check if there are duplicates in a List
Python Dictionary
- Creating Dictionaries in Python
- Iterating over Dictionaries in Python
- Check if a key exists in Dictionary
- Get list of all the keys in Dictionary
- Get list of all the Values in a Dictionary
- Remove multiple keys in Dictionary while Iterating
- Remove a key from Dictionary
- Add key/value pairs in Dictionary
- Find keys by value in Dictionary
- Sort a Dictionary by key or Value
- Copy a dictionary | Shallow vs Deep Copy
- Convert a list to dictionary
- Filter a dictionary by conditions on keys or values
- Python : How to get all keys with maximum value in a Dictionary
- How to Merge two or more Dictionaries in Python ?
Python File Handling
- How to read a file line by line in Python
- Creating a Directory in python
- Get list of files in directory and sub directories
- Get the current working directory
- Check if a directory is empty
- Change current working directory in python
- Check if a file or directory or link exists
- Get Last Modification date & time of a file
- Copy files using shutil.copy()
- Remove files by matching pattern
- Get Last Access & Creation date time of a file
- Remove a file if exists and handle errors
- How to move files and Directories
Python Process Management
Python Tuples
Python Strings
- Access characters in string by index in Python
- Iterate over the characters in string
- How to Replace characters in a string ?
- How to remove characters from a string by Index ?
- How to pad strings with zero, space or some other character in Python
- How to Compare Strings ? | Ignore case | regex | is vs == operator using Python
- Find occurrence count & all indices of a sub-string in another string | including overlapping sub-strings
- Check if a String contains a sub string & find it’s index | case insensitive
- Find frequency of each character in string and their indices | Finding duplicate characters in a string
- How to create multi line string objects in python ?
- Count occurrences of a single or multiple characters in string and find their index positions
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
C++11 Rvalue References
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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
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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 – 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
STL – MultiMap Tutorial
STL Algorithms
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.
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