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If not, you get an error that haunts careers: ORA-12154: TNS:could not resolve the connect identifier specified

Your Python prints: Connected to Oracle Database 19c Enterprise Edition. download oracle instant client 64 bit

You’ve downloaded the correct 64‑bit ZIP. You’ve extracted it to C:\oracle\instantclient_21_13 (or /usr/lib/oracle/21/client64/lib ). You’ve added it to PATH. You’ve set LD_LIBRARY_PATH or DYLD_LIBRARY_PATH or wrestled with Windows registry. You’ve copied over your tnsnames.ora . If not, you get an error that haunts

The average developer just wants oci.dll (Windows) or libclntsh.so (Linux). But Oracle doesn’t make that obvious. You have to know . download oracle instant client 64 bit