Dive into Python reading pen (3)

Chapter 6 Exceptions and file handling:

# Use Try...except to catch exceptions

# Use Try...finally to protect additional resources

# Read files

# Assign multiple values at once in a for loop

# Use OS modules to meet your cross-platform file operations needs

# dynamically instantiate classes of unknown types by taking classes as objects and passing in parameters

Chapter 7 Regular Expressions:

^ Start of matching string

$ matches the end of a string

\b The boundary of a word

\d any number

\d any non-numeric character

X? An optional X-character

x* 0 times or more x characters

x+ 1 times or more x characters

X{N,M} x characters, at least n times, up to M times

(A|b|c) A or B or C

(x) typically represents a memory group (remembered group), using the Re.search function to return the object's groups () function to get its value

Dive into Python reading pen (3)