how does try catch work in python code example

Example 1: try catch in python

try:
  print("try to run this block")
except:
  print("run this bock if there was error in earlier block")

Example 2: except as Exception:

>>> def catch():
...     try:
...         asd()
...     except Exception as e:
...         print e.message, e.args
... 
>>> catch()
global name 'asd' is not defined ("global name 'asd' is not defined",)

Example 3: try except python

# Python try: except:

try:
  print(a + b) # Program will try the add b to a
except:
  print("There was an error") # If the program will have an error in the try block
  							  # The except block will run
    						  # except block will run and then the program will continue to run
    
# Examples:
a = 1
b = 1 # <===== no error, except block skipped

a = 1
b = 'one' # <===== error, except block run