There were some mixture of 4 spaces and tab as indent.
However like case of #62 , Python 3 cannot execute when the indent is mixture of tab and spaces.
PEP 8 recommends 4 spaces for each indent, so @devquint @ChaeyeonSeo @jesusleejy @Hyuntae-Jeong @Dorika0203 unified all indentation to 4 spaces according to PEP 8.
There were some mixture of 4 spaces and tab as indent. However like case of #62 , Python 3 cannot execute when the indent is mixture of tab and spaces. PEP 8 recommends 4 spaces for each indent, so @devquint @ChaeyeonSeo @jesusleejy @Hyuntae-Jeong @Dorika0203 unified all indentation to 4 spaces according to PEP 8.