Python Learning-day2:python Foundation II

Main content:

• Variable storage
• Formatting of strings
• Bit arithmetic
• Enter ciphertext display
• If...else
• Ternary operations
• List
• Dictionary

• Variable

Name2 directly points to the memory data, when the name changes, the previously stored data values and location are unchanged, new memory space to store new data.

• Formatting of strings

The string is%s; integer%d; floating-point%f;%r is raw data, not escaped

• Bit arithmetic

• Enter ciphertext display

Introduced Getpass,import gatpass use: pwd = Getpass.gatpass ("Passwod:") Pycharm does not support running continue is jumping out of this loop, continuing the next loop break out of the entire loop

• Ternary operations

If the condition is true: result = value 1

If the condition is false: result = value 2

Space-occupying

• Tuples, not modifiable after definition
• String

• Dictionary

A key-value data type, used as a dictionary of our school, to check the details of the corresponding page by strokes and letters. Features of the dictionary:

• Dict is disordered.
• Key must be unique

Job: 1, print provincial and county level three menu, any layer of Q exit, any layer B return upper 2, shell sed replacement function. Implemented in the command line

Python Learning-day2:python Foundation II