TypeError: unorderable types: int() < str()

[emnanabli]

hello
v I'm unable to run this example using spyder(python3.5)
https://gist.githubusercontent.com/ilblackdragon/e956a9da159aade0c893467e49afd057/raw/c1d61db5c748e007923d3fae2fbb85e7593a9087/titanic_all_features.py

here is the error

TypeError: unorderable types: int() < str()

any suggestion please?