Update simple.py

[ghost]

Updated methods in example to find uid of a node and Deleting it.

---

This change is 

[coveralls]

Pull Request Test Coverage Report for Build 22

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 95.05%

---

Files with Coverage Reduction	New Missed Lines	%
pydgraph/util.py	1	100.0%

Totals
Change from base Build 19:	0.0%
Covered Lines:	192
Relevant Lines:	202

---

💛 - Coveralls

[manishrjain]

---

Reviewed 1 of 1 files at r1, 1 of 1 files at r2.
Review status: complete! all files reviewed, all discussions resolved

---

Comments from Reviewable