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Python snippets

• Basics
  • Make script directly executable with a Python interpreter
  • Get all properties and methods of an object
  • Swap values of two variables (with multiple assignment)
  • Swap values of two variables (with a third variable)
  • Check a variable is not None
  • Ternary conditional operator
  • for statement
  • for statement example
  • Iterate over a sequence of numbers (range function)
  • Iterate over a sequence of numbers (range function)
  • if statements
  • while loop
  • while loop example
  • Fibonacci series
  • break and continue statements on loops
  • Command line arguments (sys.argv)
• Strings
  • Define long string (use brackets to join multiline string)
  • Define long string (use backslash to join multiline string)
  • Define long string (use triple quotes to join a multiline string)
  • Pad a string with leading 0s
  • Reverse a string
  • Check if string is number
  • Combining strings (concatenation)
• Lists
  • Accessing and slicing a list
  • Looping over lists
  • Adding elements
  • Removing elements
  • Sorting and reversing lists
  • Simple statistics on numerical list
  • Shuffle a list
  • Randomly select an item from the list
  • Combine lists with zip iterator
  • Unpacking list of lists with zip and * operator
  • List comprehension
  • List comprehension with condition
  • List comprehension (nested loops)
  • List comprehension with if..else
  • Transpose a matrix with list comprehension
• Dictionaries
  • Convert two lists into a dictionary (with zip)
  • Convert two lists into a dictionary (with dict comprehension)
  • Looping through all key-value pairs
  • Looping through all the keys
  • Looping through all the values
  • Removing key-value pair
  • Merging two dictionaries
  • Dictionary comprehension
  • Update a dictionary’s keys with comprehension
• Lambdas
  • Lambda function syntax
  • Lambda function to add 3 numbers
  • Lambda passed as argument to function sorted
  • Lambda passed as argument to function sort
  • Lambda passed as argument to function max
• Map, Filter, Reduce
  • map syntax
  • map - Compute squares values of a list
  • map - Convert a list with strings to uppercase
  • map - Element-wise addition of 2 lists
  • filter syntax
  • filter - Get list of even numbers from a range
  • filter - Get only strings with a length of 3 characters from a list
  • reduce syntax
  • reduce - Sum up elements of a list
  • reduce - Sum up elements of a list (with an initial value)