My documentation could use some work... it's mostly just there for me right now as I test things, which is probably why you're having trouble deciphering it.

This is the bit you want to look at:

Get information on any transactions in block

In that particular example, I've set it up to do a very specific task that I was interested in - to check a block for non-coinbase transactions, and if there were any, to get the tx information. BUT, that's not necessary if all you want to do is look up a tx by hash.

The function 'get_transactions' has two inputs: 'tx_hashes' and 'block'. However, 'block' is option and not actually part of the rpc call. It's just a thing I added for optional book keeping.

The most basic implementation of this is then:

import pymonero
bitmonero = pymonero.Bitmonero()
tx_hashes = 'hash...' # OR: tx_hashes = ['hash...', 'hash...', etc...]
transactions = bitmonero.get_transactions(tx_hashes)

If you want to see the output from this, the easiest way is to add something like this:

# if tx_hashes was a string:
print(transactions.to_JSON())

# if tx_hashes was an array of strings:
n_txs = len(tx_hashes)
for i in range(0, n_txs):
    print(transactions[i].to_JSON())

This is calling the following rpc POST method:

{ 
    "txs_hashes": [ < list of hashes > ],
    "decode_as_json": True
}