%d by python and addition ValueError: unsupported format character 'O' (0x4f) at index 2

Question

i wrote a small function to do this job

x = 'INV-%05d'
m = x %(100+1)

i should have m = INV-0101

but i receive this error

ValueError: unsupported format character 'O' (0x4f) at index 2

this works without any problem, but i want to use an external variable

m = INV-%05d %(100+1)

-> m = INV-0101

because the original value should come from a saved variable

Answer 1

如错误消息中所报告的， 0x4f是大写字母O的ASCII值。看来您犯了印刷错误，并在想要零时放入O。