day-4 (Section 1-3) and supplemental content review

'' ' 
1 programming language 
  Advanced: 
  lower: 
2.python type 
  1.Javapython 
  2.cPython 
  3.pypy 
3.python program 
  1. implementation 
    1. registration period performed by the full path 
      Example: 
         C: \ python37 \ python.exe (python installation file) D: \ 1.py (the directory to write a program) 
    2. interpreter: 
       Example: 
         C: \ python37 \ python.exe 
  2 encoding (need to add on top) # 
    - * - coding: utf8 - * - (plus header) 
    # / usr / bin / the env Python! 
    added: 
        relationship between bits and bytes 
        the Unicode 
        UTF8: Chinese three bytes 
        GBK: two bytes 
4.print ( '-') 
. 5. inp = input ( '-') 
  received string type is 
  how to convert a string of digital: 
     New- int = InP (InP) 
6. the variable name 
  1. type
    1. letters 
    2. Digital 
    3. the change line 
  2. requirements. 
    1. The digital word can not 
    2 can not use the keyword 
    3. Do not use the built-in python 
7. conditional statement 
  1. Basic ...... 
  2. Nested ...... 
  3.If the else ... elif 
8.while loop 
  while condition: 
      Print ( "-") 
  added: 
  1. 
    COUNT = 0 
    while COUNT <10: 
        Print (COUNT) 
        COUNT = COUNT +. 1 
    the else: 
        Print ( 'the else') 
    Print ( 'XXX') 
  2. 
    1.count terminate the current cycle, the next cycle begins 
      COUNT = 0 
      the while COUNT <10: 
          IF COUNT ==. 7: 
              COUNT = COUNT +. 1 
              Continue following code is not executed # skip ahead while
    2.break terminate all cycles 
' '' 
# Log operations to achieve 
COUNT = 0 
the while COUNT <3: 
    the User the INPUT = ( 'username') 
    pwd = the INPUT ( 'password') 
    IF the User == 'alex' and pwd == '123456': 
        Print ( 'Welcome') 
        BREAK 
    the else: 
        Print ( 'login name or password is incorrect') 
    COUNT = COUNT + 1