The content of the string part is the value of the specified variable
1. f"str"
Example:
a = 3.1415
print(f"result: {
a:+0>7.2f}")
>>>
result: +003.14
Explanation:
Except for the variable name, the rest can be omitted
f"result: {
[a 变量名]:[+ 显示正数符号][0 补位字符][> 对齐方式][7 宽度][.2 保留小数位数][f 数据类型]}"
| alignment | < | align left |
| > | right align | |
| ^ | center alignment | |
| = | Signs are left-aligned, values are right-aligned | |
| type of data | c | The Unicode character corresponding to the integer |
| s | string | |
| d | integer | |
| f | floating point | |
| % | percentage | |
| o | Octal | |
| x/X | hexadecimal | |
| and and | Index representation | |
| g/G | 6 significant figures are reserved, and the integer part >= 7 is represented by an exponent |
Supplement:
(1) Thousand separator
a = 123456789
print(f"result: {
a:*^20,.2f}")
print(f"result: {
a:*^20_.2f}")
>>>
result: ***123,456,789.00***
result: ***123_456_789.00***
2. “str”.format()
Example:
a = 3.14
print("result: {0:x>10.2%}, {0}".format(a))
>>>
result: xxx314.00%, 3.14
Explanation:
The usage of the format part is consistent with the first method. When each {}corresponds to a variable, the index can be ignored, for example “{}{}”.format(a, b).
"result: {[0 变量索引][:x>10.2% 格式]}".format(a)
3. “str”%()
Example:
a = 3.14
b = 2.33
print("result: %06.2f, %+6.2f" % (a, b))
>>>
result: 003.14, +2.33
explain:
"%[0 格式符][6 宽度][.2 保留小数位数][f 数据类型]"
| format character | - | align left |
| 0 | Right justify and pad with 0 | |
| + | Right-aligned and + is displayed in front of positive numbers | |
| space | Right-aligned with spaces before positive numbers (for alignment with negative numbers) |
Supplement:
(1) To keep the number of decimal places
, use *and the following parameters to set the number of decimal places
a = 3.14
b = 2.33
print("result: %.*f, %+6.*f" % (2, a, 3, b))
>>>
result: 3.14, +2.330