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try: with open("", "r") as f: print(())except FileNotFoundError: print("File not found") This will print out "File not found" if the file doesn't exist. List Comprehension in Python List comprehension is a concise way to create lists in Python. It consists of an expression followe...

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  • March 6, 2024
  • 2
  • 2023/2024
  • Book review
  • Unknown

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  • python
  • java
  • coding

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  • Secondary school
  • English
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Try: with open(“file.txt”, “r”) as f: print(f.read())except FileNotFoundError: print(“File
not found”)

This will print out “File not found” if the file doesn’t exist.

List Comprehension in Python

List comprehension is a concise way to create lists in Python. It consists of an expression
followed by a for loop and/or if statement. For example, to create a list of squares from 0 to
9:

[i**2 for I in range(10)]

We can also have nested list comprehension:

[[j for j in range(5)] for I in range(10)]

Python Argument and Parameter Types

There are several types of arguments and parameters in Python:



Positional Parameters

These are the required parameters that are defined in order:



Def complicated_function(x, y): print(x, y)complicated_function(1, 2) # Output: 1 2

We can also pass arguments by name:

Complicated_function(y=2, x=1) # Output: 1 2

We can also mix positional and named arguments, but positional arguments must come
first.

Complicated_function(1, z=2, y=3) # Output: TypeError

Optional Parameters

These are parameters with default values:



Def optional_parameter_function(z=None): print(z)optional_parameter_function() #
Output: Noneoptional_parameter_function(10) # Output: 10

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