Python · Theory

list.insert()

Theory

252/268

list.insert()

list.insert() is about talking to a database from Python. Pattern is always: connect → cursor → execute → fetch or commit → close.

For list.insert(): use ? placeholders (or the driver’s params). Never build SQL with + user text — that is injection. sqlite3 is in the stdlib for practice; MySQL/Mongo need a driver.

list.insert() on the board — insert Asha, select her back, print the name. Same idea on MySQL. Close the connection.

list.insert() — output — ['Asha', 'Ravi', 'Neha']. insert at index 1.

Diagram

index →  0       1       2
  list  → [Asha,  Ravi,  Neha]

Exam tip

Steps in order: connect → execute → fetch/commit → close. Mention placeholders.

Example

# list.insert()
a = ["Asha", "Neha"]
a.insert(1, "Ravi")
print(a)

list.insert() — output: ['Asha', 'Ravi', 'Neha']. insert at index 1.

Short notes

Deflist.insert() uses connect + cursor + SQL/API.
Rulelist.insert() — parameterized queries. Never + user text into SQL.
Rememberlist.insert() — commit after write. close when done.
Traplist.insert() — open connections left hanging; passwords in source.

Python · Theory

list.insert()

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Theory

252/268

list.insert()

list.insert() is about talking to a database from Python. Pattern is always: connect → cursor → execute → fetch or commit → close.

For list.insert(): use ? placeholders (or the driver’s params). Never build SQL with + user text — that is injection. sqlite3 is in the stdlib for practice; MySQL/Mongo need a driver.

list.insert() on the board — insert Asha, select her back, print the name. Same idea on MySQL. Close the connection.

list.insert() — output — ['Asha', 'Ravi', 'Neha']. insert at index 1.

Diagram

index →  0       1       2
  list  → [Asha,  Ravi,  Neha]

Exam tip

Steps in order: connect → execute → fetch/commit → close. Mention placeholders.

Example

# list.insert()
a = ["Asha", "Neha"]
a.insert(1, "Ravi")
print(a)

list.insert() — output: ['Asha', 'Ravi', 'Neha']. insert at index 1.

Short notes

Deflist.insert() uses connect + cursor + SQL/API.
Rulelist.insert() — parameterized queries. Never + user text into SQL.
Rememberlist.insert() — commit after write. close when done.
Traplist.insert() — open connections left hanging; passwords in source.

list.insert()

Example

Short notes

Questions

list.insert()

Example

Short notes

Questions