Bug: TypeError in Job.__repr__ when unit is None

[srics96]

Bug Description

When a Job object is created but not yet fully configured (e.g., schedule.every(10).seconds without calling .do()), accessing repr() or printing the job crashes with a TypeError because self.unit is None.

Steps to Reproduce

import schedule
job = schedule.every(10)
# unit is not yet set
print(job)  # TypeError: argument of type 'NoneType' is not iterable

The crash happens in Job.__repr__ where it checks if self.unit[0] != "s" — this fails when self.unit is None.

Fix

Add a guard in __repr__ to handle None unit:

def __repr__(self):
    ...
    if self.unit is not None and self.unit[0] != "s":
        ...

References

• Upstream: fix: guard against self.unit being None in Job.__repr__ dbader/schedule#655, fix: guard self.unit against None in Job.__repr__ dbader/schedule#653, fix: guard self.unit against None in __repr__ dbader/schedule#652, Fix TypeError in repr when unit is None and interval is 1 dbader/schedule#651 (4 duplicate PRs, all unmerged)
• Affects any code that inspects partially-configured Job objects