The Constitution of India came into force on 26 January 1950. Although, the process of the evolution of the constitution had started many years before India got its independence. In fact, the constitution of India has originated from its struggle for independence from Britain as well as the demand for responsible and constitutional government.
Most of its political part is borrowed from the constitution of Britain and has input from other constitutions as well.
When India got its independence on 15 August 1947, the Constituent Assembly was set up as the sovereign body to frame the Constitution as well as ordinary laws.
Although, the constitution of India is written in nature it has been amended several times. However, the amendment process is neither as rigid as we find in USA nor as flexible as we find in England.
Please go through all the articles given below which will give you a gist of the Indian constitution.
Acts passed before Constitution
Making of the Constituent Assembly
Features taken from other Countries
Important Amendments at a Glance