Python中使用%进行格式化输出

1. 打印字符串

print("His name is %s" % "Kenn")

效果：

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2.打印整数

print("He is %d years old" % 25)

print("He is %d years old, and born in %d" % (25, 1990))

效果：

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3.打印浮点数

print("His height is %f m" % 1.83)

效果：

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4.打印浮点数（指定保留小数点位数，四舍五入）

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print("His height is %.2f m" % 1.84)
print("His height is %.1f m" % 1.84)
print("His height is %.2f m" % 1.85)
print("His height is %.1f m" % 1.85)

效果：

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5.指定占位符宽度（右对齐）

print("Name:%10s Age:%8d Height:%8.2f" % ("Kenn", 25, 1.83))

效果：

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6.指定占位符宽度（左对齐）

print("Name:%-10s Age:%-8d Height:%-8.2f" % ("Kenn", 25, 1.83))

效果：

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7.指定占位符

print("Name:%-10s Age:%08d Height:%08.2f" % ("Kenn", 25, 1.83))

效果：

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8.科学计数法

print(format(0.00154, '.2e'))
print(format(154000, '.2e'))
print(format(0.00154, '.1e'))
print(format(154000, '.1e'))
print(format(0.00155, '.1e'))
print(format(155000, '.1e'))

效果：