# 單雙引號(hào)通用
msg = "Hello 數(shù)據(jù)科學(xué)家！"
path = r'C:\new_folder'  # 原始字符串避免轉(zhuǎn)義

# 切片操作 [start:end:step]
text = "Python超實(shí)用"
print(text[2:5])     # tho
print(text[::-1])    # 用實(shí)超nohtyP

names = ["張偉", "李娜", "王陽(yáng)"]

# 傳統(tǒng)方式（性能低）
full_str = names[0] + "," + names[1] + "," + names[2]

# 高效方式
print(",".join(names))  # 張偉,李娜,王陽(yáng)

# 現(xiàn)代方式（推薦）
print(f"獲獎(jiǎng)?wù)撸簕names[0]}、{names[1]}、{names[2]}")

# 拆分CSV數(shù)據(jù)
csv_data = "ID,Name,Salary\n101,張三,15000"
rows = csv_data.split('\n')
for row in rows:
    cols = row.split(',')
    print(cols)

# 重組URL路徑
folders = ['img','2024','logo.png']
print('/'.join(folders))  # img/2024/logo.png

log = "ERROR: File not found [code:404]"

# 定位關(guān)鍵信息
print(log.find("404"))    # 28
print("ERROR" in log)     # True

# 敏感信息脫敏
secure_log = log.replace("404", "XXX")
print(secure_log)  # ERROR: File not found [code:XXX]

# 1. %格式化（經(jīng)典）
print("溫度：%.1f°C" % 23.456)  # 溫度：23.5°C

# 2. str.format()（靈活）
print("坐標(biāo)：({x},{y})".format(x=120, y=89))

# 3. f-string（推薦）
name = "Alice"
print(f"歡迎{name.upper()}！積分：{1000*1.2:.0f}")

raw_text = "  Python數(shù)據(jù)分析  \t\n"

# 去空格
clean_text = raw_text.strip()  
print(clean_text)  # "Python數(shù)據(jù)分析"

# 大小寫(xiě)轉(zhuǎn)換
print(clean_text.upper())  # PYTHON數(shù)據(jù)分析
print(clean_text.lower())  # python數(shù)據(jù)分析

# 首字母大寫(xiě)
print("hello world".title())  # Hello World

def clean_text_data(text):
    """文本清洗標(biāo)準(zhǔn)化流程"""
    # 1. 去除首尾空白
    text = text.strip()  
    # 2. 轉(zhuǎn)換為小寫(xiě)
    text = text.lower()  
    # 3. 替換特殊字符
    text = text.replace('$', 'USD').replace('￥', 'CNY')
    # 4. 分割重組
    words = text.split()
    return ' '.join(words[:5])  # 保留前5個(gè)詞

raw_data = "  $19.99 限時(shí)優(yōu)惠 買(mǎi)一送一  "
print(clean_text_data(raw_data))  
# 輸出：usd19.99 限時(shí)優(yōu)惠 買(mǎi)一送一