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开发文档/python/代码片段.md

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+
+# postgresql数据库连接
+```python
+import psycopg2 as pg
+def db_conn(sql,query=None):
+    try:
+        conn = pg.connect(database='video_data',user='videos',password='Vi2023**',host='124.71.39.185',port='9900')
+        cursor = conn.cursor()
+        cursor.execute(sql)
+        conn.commit()
+        # res = cursor.fetchall()
+        if sql[:6]=="SELECT" and query == 0:
+            # 返回所有查询结果
+            return cursor.fetchall()
+        if sql[:6] == "SELECT" and query == 1:
+            # 返回1条查询结果
+            return cursor.fetchone()
+        else:
+            return True
+    except pg.DatabaseError as e:
+        # conn.rollback()
+        print(f'DB_ERROR: {e}')
+        return False
+    finally:
+        if conn:
+            conn.close()
+sql='select * from table_name;'
+db_conn(sql)
+```
+# 随机字符串生成
+```python
+# 秘钥生成器
+import random
+str1 = '0123456789'
+str2 = 'abcdefghijklmnopqrstuvwxyz'
+str3 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+str4 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+def auto_key(number):
+'''number:生成的字符串位数'''
+    # 设置随机数种子
+    random.seed(random.randint(1,1000))
+    str=''
+    for i in range(number):
+        str+=random.choice(str4)
+    print(str)
+    return str
+auto_key(24)
+
+```
+# 列出主机的音频设备信息
+```python
+import pyaudio
+
+p = pyaudio.PyAudio()
+for i in range(p.get_device_count()):
+    d_info=p.get_device_info_by_index(i)
+    print(d_info)
+```
+# 音频录制
+```python
+import pyaudio
+import os
+from pydub import AudioSegment
+
+buffer = 1024
+bits = pyaudio.paInt16
+channel = 2
+hz = 48000
+sour_path = "D:\\3-option\\music\\"
+record_second = 10
+
+# 实例化PyAudio对象
+p = pyaudio.PyAudio()
+# 使用立体声混音(录制扬声器的声音)
+# stream = p.open(rate=hz,channels=channel,format=bits,input=True,frames_per_buffer=buffer,input_device_index=11)
+# 选择录音设备，这里我们选择麦克风
+stream = p.open(format=bits,
+                 channels=channel,
+                 rate=hz,
+                 input=True,
+                 frames_per_buffer=buffer,
+                 input_device_index=1)
+
+# 从麦克风直接录制FLAC格式音频
+audio = AudioSegment.empty()
+
+def record_audio():
+    for i in range(0, int(hz * record_second / buffer)):
+        data = stream.read(buffer)
+        audio += AudioSegment(data, sample_width=p.get_sample_size(bits), frame_rate=hz, channels=channel)
+    return audio
+
+audio = record_audio()
+audio.export("f:\\music\\test.flac", format="flac")
+
+# 关闭流和PyAudio对象
+stream.stop_stream()
+stream.close()
+p.terminate()
+
+```
+# 音频格式转换
+```python
+import os
+from pydub import AudioSegment  
+def convert(file_name,file_format):
+    AudioSegment.from_file(audio_file_path)
+    audio.export(path2+i.replace(file_name.spilt('.')[1], file_format), format=file_format)
+def batch_convert(**kwargs):
+    '''source_path: 源文件路径，destination_path: 目标文件路径, file_format: 要转换的文件格式'''
+    source_path = kwargs['source_path']
+    destination_path = kwargs['destination_path']
+    file_format = kwargs['file_format']
+    for i in os.listdir(source_path):
+        try:
+            convert(file_name=i,file_format=file_format)
+        except:
+            print(i,'转换失败!')
+source_path = "D:\\10-百果园-工作资料\\01-常用音乐\\"
+destination_path="D:\\10-百果园-工作资料\\new\\"
+file_format = 'flac'
+batch_convert(source_path=source_path,destination_path=destination_path,file_format=file_format)
+```