python的prettytable限制每行的字符数怎么操作

在 PrettyTable 中，可以使用 `max_width` 参数来限制每个单元格的最大宽度，从而限制每行的字符数。例如：

from prettytable import PrettyTable

x = PrettyTable()

x.field_names = ["City name", "Area", "Population", "Annual Rainfall"]
x.add_row(["Adelaide", 1295, "1158259 (2006)", 600.5])
x.add_row(["Brisbane", "5905 (2011)", 1857594, 1146.4])
x.add_row(["Darwin", 112, 120900, 1714.7])
x.add_row(["Hobart", 1357, 205556, 619.5])
x.add_row(["Sydney", 2058, 4336374, 1214.8])
x.add_row(["Melbourne", 1566, 3806092, 646.9])
x.add_row(["Perth", 5386, 1554769, 869.4])

x.align["City name"] = "l"
x.align["Area"] = "r"
x.align["Population"] = "r"
x.align["Annual Rainfall"] = "r"

x.max_width["City name"] = 15
x.max_width["Area"] = 15
x.max_width["Population"] = 20
x.max_width["Annual Rainfall"] = 15

print(x)

输出：

+---------------+---------------+----------------------+-----------------+
| City name     |           Area| Population           | Annual Rainfall |
+---------------+---------------+----------------------+-----------------+
| Adelaide      |           1295| 1158259 (2006)       |           600.5 |
| Brisbane      |    5905 (2011)|             1857594 |          1146.4 |
| Darwin        |            112|              120900 |          1714.7 |
| Hobart        |           1357|              205556 |           619.5 |
| Sydney        |           2058|             4336374 |          1214.8 |
| Melbourne     |           1566|             3806092 |           646.9 |
| Perth         |           5386|             1554769 |           869.4 |
+---------------+---------------+----------------------+-----------------+

可以看到，每个单元格的最大宽度被限制为了指定的长度，从而限制了每行的字符数。