Sigma and pi bonds are types of covalent bonds that differ in the overlapping of atomic orbitals. Covalent bonds are formed by the overlapping of atomic orbitals. Sigma bonds are a result of the head-to-head overlapping of atomic orbitals whereas pi bonds are formed by the lateral overlap of two atomic orbitals.

Number of sigma bonds present in pyridine molecule is 11. Number of pi bonds present in pyridine molecule is 3. And number of lone pair of electrons is 1.