On the NodeMCU clone I used to test with I got an out of memory error when trying to import the ina219 module, this is due to there being insufficient RAM to compile this module to byte code. If you encounter this issue then you can use mpy-cross to create a .mpy file.
This is an example script:
from machine import Pin, I2C
from ina219 import INA219
from logging import INFO
SHUNT_OHMS = 0.1
i2c = I2C(-1, Pin(5), Pin(4))
ina = INA219(SHUNT_OHMS, i2c, log_level=INFO)
ina.configure()
print("Bus Voltage: %.3f V" % ina.voltage())
print("Current: %.3f mA" % ina.current())
print("Power: %.3f mW" % ina.power())