| Race Condition |
| rad2deg function |
| radians function |
| randbytes function |
| randint function |
| random function |
| random Module |
| Random Numbers |
| random.choice |
| random.random |
| random.randrange |
| random.uniform |
| randrange function |
| range function |
| Range - Excel |
| Rank |
| Read Eval Print Loop (REPL) |
| Reading Text Files |
| real function |
| real_if_close function |
| reciprocal function |
| Recording Macros |
| Redo |
| Reentrant |
| Reference Count |
| References |
| Registry |
| Regular Expressions |
| Regular Package |
| remainder function |
| Removing Classes |
| Removing Items from Arrays |
| Removing Items from Collections |
| Removing Substrings |
| Repeating Character a Number of Times |
| REPL (Read Eval Print Loop) |
| Replacing Text |
| repr function |
| Resizing Arrays |
| return |
| reversed function |
| Reversing Strings |
| Reversing Words |
| Ribbon Customisation |
| rint function |
| round function |
| RTD (Real Time Data) |
| Rubber Duck Debugging |
| RuntimeError |