Python 以指定宽度格式化输出

当对一组数据输出的时候，我们有时需要输出以指定宽度，来使数据更清晰。

1 mat = "{:20}\t{:28}\t{:32}"
print(mat.format("占4个长度","占8个长度", "占12长度"))

2 #如果需要居中输出在宽度前面加一个^
mat = "{:^20}\t{:^28}\t{:^32}"
print(mat.format("占4个长度","占8个长度", "占12长度"))

3 居左<或居右 >
mat = "{:<20}\t{:^28}\t{:>32}"
4、例如
#!/usr/bin/python3

import hashlib
import sys
import random
import string
import cx_Oracle

if __name__ == '__main__':
if len(sys.argv) < 1 :
print("Usage: %s cid uid" % (sys.argv[0]))
sys.exit()
id= sys.argv[1]

conn = cx_Oracle.connect('abc/123456@ip:1521/db')
cursor = conn.cursor()

mydb1 = f"select id,userid,password from user where id={id} order by password"

try:
cursor.execute(mydb1)
except Exception as e:
conn.rollback()
print('failed', e)
else:
conn.commit()
for id,userid,password in cursor:
mat = "{:^5} {:<20}\t{:^32}"
print(mat.format(id,userid,password))

cursor.close()
conn.close()

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