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My init.sage is as follows. It is run at the start of each Sage REPL session.

### Set colors depending on terminal background color

# Set color -- valid schemes: 'NoColor', 'Linux', 'LightBG', Neutral', ''

%colors Linux

### Custom banner, displays even when starting Sage in quiet mode with `sage -q`

print("\n# SageMath {}, released {}, based on Python {}.{}.{}."
.format(sage.version.version, sage.version.date, *sys.version_info[:3]))

print("""
sage: %colors Linux
""")

It includes two commands that print things out, and that works fine.

Beware that print is a function in Python 3, while it was a statement in Python 2.

So make sure you use print(...) rather than print ....

My init.sage is as follows. It is run at the start of each Sage REPL session.

### Set colors depending on terminal background color

# Set color -- valid schemes: 'NoColor', 'Linux', 'LightBG', Neutral', ''

%colors Linux

### Custom banner, displays even when starting Sage in quiet mode with `sage -q`

print("\n# SageMath {}, released {}, based on Python {}.{}.{}."
.format(sage.version.version, sage.version.date, *sys.version_info[:3]))

### Set colors depending on terminal background color

# Set color -- valid schemes: 'NoColor', 'Linux', 'LightBG', Neutral', ''

print("""
sage: # To set the color scheme, use one of the following,
# where 'LightBG' is well suited for light background,
# while 'Linux' is well suited for dark background:

%colors LightBG
%colors Linux
%colors Neutral
%colors NoColor

# This can also be changed in the IPython configuration file,
# see answer by Sébastien to Ask Sage question 
""")

It includes two commands that print things out, and that works fine.

Beware that print is a function in Python 3, while it was a statement in Python 2.

So make sure you use print(...) rather than print ....

load(sage.env.SAGE_STARTUP_FILE)