How did Spielberg make the snake pit scene in Raiders of the Lost Ark?

The Snake Pit on motion pictures critiques:
Query by Somaesthesia: How did Spielberg make the snake pit scene in Raiders of the Lost Ark?
How did Spielberg film the snake pit scene in Raiders of the Lost Ark? Did they actually stroll by way of the snakes (on major of them), or did they have a sort of path for the actors and stunt doubles to stroll on, so they did not step on major of them? Also, had been these actually venomous snakes, or had been they non-venomous? I know they are really live

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