[英]Python string format ignored when ANSI escape sequence characters are in the string
当字符串中包含ANSI 转义序列字符时,为什么字符串格式会被忽略?
示例(Python 3.9.1) :
execution_times = [0, 12]
for execution_time in execution_times:
affected_row_count = 26953
c = ''
cgrey = ''
endc = ''
if execution_time == 0:
cgrey = '\33[90m'
if execution_time > 0:
c = '\033[94m'
endc = '\033[0m'
rows_affected_text = f' ({affected_row_count} rows affected)'
elapsed_time_text = f'Elapsed Time: {c}{execution_time}{endc} secs'
print(f'{cgrey}{elapsed_time_text:25s}{rows_affected_text}\033[0m')
预期的 output 将是:
Elapsed Time: 0 secs (26953 rows affected)
Elapsed Time: 12 secs (26953 rows affected)
但相反它会产生
Elapsed Time: 0 secs (26953 rows affected)
Elapsed Time: 12 secs (26953 rows affected)
:25s
字符串格式被忽略; 我错过了什么?
因为计算 alignment 格式时考虑了cgrey
、 c
和endc
。
尝试打印字符串的原始字节。
# ...
x = f'{cgrey}{elapsed_time_text:25s}{rows_affected_text}\033[0m'
print(x)
print(x.encode())
结果:
Elapsed Time: 0 secs (26953 rows affected)
b'\x1b[90mElapsed Time: 0 secs (26953 rows affected)\x1b[0m'
Elapsed Time: 12 secs (26953 rows affected)
b'Elapsed Time: \x1b[94m12\x1b[0m secs (26953 rows affected)\x1b[0m'
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