[Python] Insert new column (of blanks) into an existing dataframe

I have an existing dataframe:

data = [[5011025, 234], [5012025, 937], [5013025, 625]]
df = pd.DataFrame(data)


output:

0 1
0 5011025 234
1 5012025 937
2 5013025 625


What I need to do is insert a new column at 0 (the same # of rows) that contains 3 spaces. Recreating the dataframe, from scratch, it would be something like this:

data = [[' ',5011025, 234], [' ',5012025, 937], [' ',5013025, 625]]
df = pd.DataFrame(data)


desired output:

0 1 2
0 5011025 234
1 5012025 937
2 5013025 625


What is the best way to insert() this new column into an existing dataframe, that may be hundreds of rows? Ultimately, i'm trying to figure out how to write a function that will shift all columns of a dataframe x number of spaces to the right.

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