Data type conversion and conditional control statements

1. Data type conversion ：
  Will float , String to integer

Convert floating point to integer ：

String to integer ：

  The integer , String to floating point

Integer to floating point ：

 

String to floating point ：

  Binary , octal ,16 Base to 10 Base number

print(int(0b100))
print(int(0o100))
print(int(0x100))
 result ：4
     64
     256

  take 10 Base to zero , Binary system , octal ,16 Base number

print(bin(4))
print(oct(64))
print(hex(256))
 result ：0b100
     0o100
     0x100

  Convert string to byte

  Convert bytes to strings

 

 

  take ascii Code to string

print(chr(97))
 result ：a

  Converts a string to ascii code

print(ord('a'))
 result ：97

2. Conditional control statements
  A: 86-100, B: 71-85, C: 61-70, D: 0-60
  Enter a grade and print out the grade ( Required if ... elif)