"""
槽的格式限定
冒号：左边填序号或名称，右边填写格式
"""

print("财务计数法")
n = "{:,}".format(123456789)
print(n)

print("百分比")
n2 = "{:.2%}".format(0.28)
print(n2)

print("科学计数法")
n3 = "{:.2e}".format(12000000)
print(n3)