How to parse a string into a floating point number or integer

In Python programming, it is often necessary to convert strings to each other

The following methods can be used to convert data types in Python:

int(str) The function converts a string that conforms to the integer specification into an int type.

   num2 = "123";    
   num2 = int(num1);    
   print("num2: %d" % num2);    
'''    
输出  num2: 123    
'''

float(str) The function converts a string that conforms to the floating point specification into a float type.

  num1 = "123.12";
   num2 = float(num1);
   print("num2: %f" % num2);    
   '''
   num2: 123.120000
   '''

str(num) Convert integers and floating point types into strings

  num = 123;    
  mystr = str(num);    
  print ("%s" % mystr);    
  ''' 输出 123   '''

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