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Table of Contents

  • How to Join Strings in Python Using .join()
    • Join With an Empty String
    • Combine Strings of Characters
  • Join Elements of an Iterable With Specific Separators
    • Create Comma-Delimited Output
    • Collapse a List of URL Parts
    • Use Multicharacter Separators
  • Detangle Surprising Errors When Using .join()
    • Non-String Values in the Iterable
    • Non-Iterable Types
    • .join() Called on the Wrong Object
  • Consider the + Operator or F-Strings for Simple Scenarios
  • Create an Event Log String: Practical Example
  • Understand How str.join() Optimizes String Concatenation
    • Pre-Pass: Check Types and Calculate Needed Space
    • Second Pass: Copy Once and Insert Separators
    • Compare .join() to Using += in a Loop
  • Conclusion
  • Frequently Asked Questions