From d9f68235d0cee5788807f614361c8d0f02122cdc Mon Sep 17 00:00:00 2001
From: "rick.chan" <chenyang@autoai.com>
Date: Mon, 23 Nov 2020 18:22:35 +0800
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Signed-off-by: rick.chan <chenyang@autoai.com>
---
 ...之间的转换.md => Python_string_与_bytes.md} | 22 ++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)
 rename Software/Development/Language/Python/{Python_string_与_bytes_之间的转换.md => Python_string_与_bytes.md} (62%)

diff --git a/Software/Development/Language/Python/Python_string_与_bytes_之间的转换.md b/Software/Development/Language/Python/Python_string_与_bytes.md
similarity index 62%
rename from Software/Development/Language/Python/Python_string_与_bytes_之间的转换.md
rename to Software/Development/Language/Python/Python_string_与_bytes.md
index 0ffa9c2..c5f322a 100644
--- a/Software/Development/Language/Python/Python_string_与_bytes_之间的转换.md
+++ b/Software/Development/Language/Python/Python_string_与_bytes.md
@@ -1,4 +1,4 @@
-# Python string 与 bytes 之间的转换
+# Python string 与 bytes
 
 总的来说，bytes 和 string 的关系是：
 
@@ -40,3 +40,23 @@ s = str(s, encoding = "utf8")   # string
 s = '\\u4eca\\u5929\\u5929\\u6c14\\u4e0d\\u9519'    # 中文是：今天天气真不错
 new_s = s.encode().decode('unicode_escape')         # 输出为：今天天气真不错
 ```
+
+## 4.string 开头 r/b/u/f 的含义
+
+```python
+b'input\n' # bytes字节符，打印以b开头。输出：b'input\n'
+r'input\n' # 非转义原生字符，经处理'\n'变成了'\\'和'n'。也就是\n表示的是两个字符，而不是换行。输出：'input\\n'
+u'input\n' # unicode编码字符，python3默认字符串编码方式。输出：'input\n'
+```
+
+f 开头：
+
+```python
+import time
+t0 = time.time()
+time.sleep(1)
+name = 'processing'
+print(f'{name} done in {time.time() - t0:.2f} s')  # 以f开头表示在字符串内支持大括号内的python 表达式
+输出：
+processing done in 1.00 s
+```