Why the do these return different values?

hash.go

package main

import (
	"crypto/hmac"
	"crypto/sha1"
	"fmt"
)

func main() {
	salt := []byte("nJ1m4Cc3")
	hasher := hmac.New(sha1.New, salt)
	fmt.Printf("%x\n", hasher.Sum(nil))
	// f7c0aebfb7db2c15f1945a6b7b5286d173df894d
}

hash.py

import hashlib
salt =  "nJ1m4Cc3"
hasher = hashlib.new("sha1", salt)
print hasher.hexdigest()
# d67c1f445987c52bceb8d6475c30a8b0e9a3365d