what does try and except do in python code example

Example 1: try except python

try:
  print("I will try to print this line of code")
except:
  print("I will print this line of code if an error is encountered")

Example 2: try except python

try:
  print("I will try to print this line of code")
except ERROR_NAME:
  print("I will print this line of code if error ERROR_NAME is encountered")

Example 3: try except python

age = input('age:')


try:
    new_age = int(age)
except ValueError: # if age is not convertable to int
    print('please enter a number...')