> For the complete documentation index, see [llms.txt](https://docs.r.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.r.xyz/glider-ide/api/instruction/instruction.source_lines.md).

# Instruction.source\_lines()

Query

```python
from glider import *
def query():
  #fetch a list of instructions
  instructions = Instructions().exec(1) 
  #print the corresponding source line numbers of the instruction
  print(instructions[0].source_lines())
  return []
```

Output

```json
{
  "print_output": [
    "[19, 20, 21]"
  ]
}
```