Python: Strings, Bytes, Lists, Dictionaries

Strings and Bytes

• Single and multi-line string quoting
• Adjacent string literal concatenation
• Universal newlines
• Escapes sequences for control characters
• Raw strings suppress the escaping mechanism
• Convert other types using

  • str()

• Python 3 source encoding is in UTF-8
• str (String) is a sequence of Unicode codepoints
• bytes is a sequence of bytes
• Convert str to bytes

  • encode()

• Convert bytes to str

  • decode()

Lists

numbers = [1,2,3,4]
# look a list!

• Lists are a sequences of objects
• List literals are made by using square brackets “[]” and items are seperated by commas “,”
• List indexing is zero based, you can access object by their number
  • numbers[0]
• Add more to lists

  • append()

Dictionaries

dictionary = {Key1: Value1, Key2: Value2}
# look a dictionary!

• Dictionaries associate keys with values
• You make dicts using curly braces
• Key-value pairs are seperated by commas, with colon in between each key and value.
• You can access certain values by:

  • dictionary['Key1']

  • OUTPUT: Value1