![\"\"](\"https:\/\/softasia.jp\/blog\/wp-content\/uploads\/2025\/09\/SOFT_ASIA_\u30a2\u30a4\u30ad\u30e3\u30c3\u30c1-11-300x169.png\")
<\/p>\n<\/p>\n
<\/p>\n
Python\u3067\u6587\u5b57\u5217\u3092\u51e6\u7406\u3059\u308b\u3068\u304d\u306b\u3001\u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u308b\u6a5f\u80fd\u306e\u4e00\u3064\u304c<\/span>replace\u30e1\u30bd\u30c3\u30c9<\/span>\u3067\u3059\u3002<\/span>\u300c\u7279\u5b9a\u306e\u6587\u5b57\u3084\u5358\u8a9e\u3092\u307e\u3068\u3081\u3066\u5909\u3048\u305f\u3044<\/span>\u300d\u300c\u4f59\u8a08\u306a\u8a18\u53f7\u3092\u6d88\u3057\u305f\u3044<\/span>\u300d\u300c\u7f6e\u63db\u56de\u6570\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u305f\u3044<\/span>\u300d<\/strong>\u3068\u3044\u3063\u305f\u30cb\u30fc\u30ba\u306b\u5fdc\u3048\u3066\u304f\u308c\u308b\u306e\u304c str.replace()<\/span>\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/span>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u521d\u5fc3\u8005\u306e\u65b9\u3067\u3082\u30b9\u30c3\u3068\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u57fa\u672c\u69cb\u6587\u304b\u3089\u5b9f\u52d9\u3067\u5f79\u7acb\u3064\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/span><\/p>\n \u76ee\u6b21<\/p> <\/p>\n \u57fa\u672c\u69cb\u6587<\/b><\/p>\n \u6587\u5b57\u5217.replace(old, new, count)<\/span><\/p>\n <\/p>\n <\/p>\n \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/b><\/p>\n text = “I like apples.”<\/span><\/p>\n new_text = text.replace(“apples”, “oranges”)<\/span><\/p>\n print(new_text)\u00a0 # I like oranges.<\/span><\/p>\n <\/p>\n \u30dd\u30a4\u30f3\u30c8\u306f\u3001<\/span>\u5143\u306e\u6587\u5b57\u5217\u306f\u5909\u66f4\u3055\u308c\u305a\u3001\u65b0\u3057\u3044\u6587\u5b57\u5217\u304c\u8fd4\u3063\u3066\u304f\u308b<\/strong><\/span>\u3053\u3068\u3067\u3059<\/strong><\/span>\u3002\u65e2\u5b58\u306e\u5909\u6570\u306b\u4e0a\u66f8\u304d\u3057\u305f\u3044\u5834\u5408\u306f text = text.replace(…) \u3068\u66f8\u3051\u3070OK\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n \u5148\u982d\u304b\u3089\u6307\u5b9a\u56de\u6570\u3060\u3051\u7f6e\u63db<\/b><\/p>\n text = “apple apple apple”<\/span><\/p>\n new_text = text.replace(“apple”, “orange”, 2)<\/span><\/p>\n print(new_text)\u00a0 # orange orange apple<\/span><\/p>\n <\/p>\n count\u306b\u300c2\u300d\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u5148\u982d\u304b\u30892\u56de\u3060\u3051\u7f6e\u63db\u3055\u308c\u307e\u3059\u3002<\/span><\/p>\n <\/p>\n \u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u306b\u6ce8\u610f<\/b><\/p>\n replace<\/span>\u306f\u5927\u6587\u5b57\u30fb\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u307e\u3059\u3002<\/b><\/p>\n text = “Python python PyThOn”<\/span><\/p>\n print(text.replace(“python”, “Java”))\u00a0 # Python Java PyThOn<\/span><\/p>\n <\/p>\n \u5168\u90e8\u7f6e\u63db\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u3042\u3089\u304b\u3058\u3081 lower() \u3084 upper() \u3067\u6587\u5b57\u5217\u3092\u7d71\u4e00\u3059\u308b\u306e\u304c\u30b3\u30c4\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n \u30c7\u30fc\u30bf\u6574\u5f62\u3084\u81ea\u52d5\u51e6\u7406\u3067\u306f\u3001\u7f6e\u63db\u7d50\u679c\u3092\u691c\u8a3c\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059<\/span>\u3002<\/span><\/p>\n <\/p>\n original = “price: $100”<\/span><\/p>\n converted = original.replace(“$”,”\uffe5”)<\/span><\/p>\n if original != converted:<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0print(“\u7f6e\u63db\u3055\u308c\u307e\u3057\u305f:”, converted)<\/span><\/p>\n <\/p>\n \u7f6e\u63db\u304c\u6b63\u3057\u304f\u884c\u308f\u308c\u305f\u304b\u3069\u3046\u304b\u3092\u81ea\u52d5\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n <\/p>\n \u9023\u7d9a\u3057\u3066replace\u3092\u4f7f\u3046<\/b><\/p>\n text = “red green blue”<\/span><\/p>\n text = text.replace(“red”, “RED”).replace(“green”, “GREEN”)<\/span><\/p>\n print(text)<\/span><\/p>\n <\/p>\n \u30b7\u30f3\u30d7\u30eb\u306a\u5834\u5408\u306f\u9023\u7d9a\u3057\u3066\u66f8\u3051\u3070OK\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n \u8f9e\u66f8\uff0b\u30eb\u30fc\u30d7\u3067\u4e00\u62ec\u7f6e\u63db<\/b><\/p>\n text = “I like apples and bananas.”<\/span><\/p>\n replacements = {“apples”:”oranges”,”bananas”:”grapes”}<\/span><\/p>\n for old,new in replacements.items():<\/span><\/p>\n \u00a0\u00a0\u00a0\u00a0text = text.replace(old,new)<\/span><\/p>\n print(text)<\/span><\/p>\n <\/p>\n \u8907\u6570\u306e\u5358\u8a9e\u3092\u4e00\u5ea6\u306b\u5909\u3048\u305f\u3044\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n <\/p>\n <\/p>\n \u8a18\u53f7\u3084\u6570\u5b57\u306e\u524a\u9664\u30fb\u5909\u63db<\/b><\/p>\n text = “TEL:03-1234-5678”<\/span><\/p>\n print(text.replace(“-“, “”))\u00a0 # TEL:0312345678<\/span><\/p>\n <\/p>\n \u96fb\u8a71\u756a\u53f7\u306a\u3069\u306e\u30cf\u30a4\u30d5\u30f3\u3092\u307e\u3068\u3081\u3066\u524a\u9664\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n <\/p>\n \u6539\u884c\u30fb\u30bf\u30d6\u6587\u5b57\u3092\u524a\u9664<\/b><\/p>\n text = “Hello\\nWorld\\t!”<\/span><\/p>\n cleaned = text.replace(“\\n”, ” “).replace(“\\t”, ” “)<\/span><\/p>\n print(cleaned)<\/span><\/p>\n <\/p>\n \u6539\u884c\u30fb\u30bf\u30d6\u6587\u5b57\u3092\u7a7a\u767d\u306b\u7f6e\u63db\u3059\u308c\u3070\u3001\u6574\u5f62\u3055\u308c\u305f1\u884c\u30c6\u30ad\u30b9\u30c8\u304c\u4f5c\u308c\u307e\u3059\u3002<\/span><\/p>\n <\/p>\n CSV\u3084\u30ed\u30b0\u306e\u6574\u5f62<\/b><\/p>\n row = “Alice,25,Female”<\/span><\/p>\n print(row.replace(“,”, “\\t”))\u00a0 # \u30bf\u30d6\u533a\u5207\u308a\u306b\u5909\u63db<\/span><\/p>\n <\/p>\n \u30ed\u30b0\u89e3\u6790\u3084\u30c7\u30fc\u30bf\u30af\u30ec\u30f3\u30b8\u30f3\u30b0\u3067\u4fbf\u5229\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n \u30ea\u30b9\u30c8\u5185\u3067\u306e\u4e00\u62ec\u7f6e\u63db<\/b><\/p>\n words = [“apple”,”banana”,”apple”]<\/span><\/p>\n words = [w.replace(“apple”,”orange”) for w in words]<\/span><\/p>\n print(words)<\/span><\/p>\n <\/p>\n \u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u3067\u4e00\u6c17\u306b\u7f6e\u63db\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n <\/p>\n pandas\u3067\u306e\u4e00\u62ec\u7f6e\u63db<\/b><\/p>\n import pandas as pd<\/span><\/p>\n df = pd.DataFrame({“fruit”: [“apple”, “banana”, “apple”]})<\/span><\/p>\n df[“fruit”] = df[“fruit”].str.replace(“apple”, “orange”)<\/span><\/p>\n print(df)<\/span><\/p>\n <\/p>\n # \u8f9e\u66f8\u3092\u4f7f\u3063\u305f\u8907\u6570\u7f6e\u63db<\/span><\/p>\n df = df.replace({“fruit”: {“banana”: “grape”, “orange”: “melon”}})<\/span><\/p>\n print(df)<\/span><\/p>\n \u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u5834\u5408\u3001pandas\u3092\u4f7f\u3046\u3068\u9ad8\u901f\u304b\u3064\u7c21\u5358\u3067\u3059\u3002<\/span><\/p>\n <\/p>\n <\/p>\n replace\u306f\u56fa\u5b9a\u6587\u5b57\u5217\u3057\u304b\u6271\u3048\u307e\u305b\u3093\u304c\u3001\u30d1\u30bf\u30fc\u30f3\u306b\u30de\u30c3\u30c1\u3059\u308b\u6587\u5b57\u5217\u3092\u7f6e\u63db\u3057\u305f\u3044\u5834\u5408\u306fre.sub\u304c\u4fbf\u5229\u3067\u3059<\/span>\u3002<\/span><\/p>\n <\/p>\n import re<\/span><\/p>\n text = “My number is 123-456-7890.”<\/span><\/p>\n new_text = re.sub(r”\\d”, “X”, text)<\/span><\/p>\n print(new_text)\u00a0 # My number is XXX-XXX-XXXX.<\/span><\/p>\n <\/p>\n <\/p>\n \u8907\u96d1\u306a\u6761\u4ef6\u7f6e\u63db\u3092\u3057\u305f\u3044\u3068\u304d\u306f re.sub \u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n <\/p>\n replace()\u30e1\u30bd\u30c3\u30c9\u306f\u300c\u6587\u5b57\u5217\u300d\u5c02\u7528\u3067\u3059\u3002None\u3084\u6570\u5024\u306a\u3069\u3001\u6587\u5b57\u5217\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u4f7f\u3046\u3068<\/p>\n <\/p>\n AttributeError: ‘NoneType’ object has no attribute ‘replace’<\/span><\/p>\n <\/p>\n \u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n <\/p>\n \u30a8\u30e9\u30fc\u3092\u9632\u3050\u306b\u306f\u3001\u4e8b\u524d\u306b\u578b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u305f\u308a\u3001\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3066\u304b\u3089replace()\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n <\/p>\n value = None<\/span><\/p>\n # \u578b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304b\u3089replace\u3092\u5b9f\u884c<\/span><\/p>\n if isinstance(value, str):<\/span><\/p>\n \u00a0 \u00a0 <\/span>value = value.replace(“old”, “new”)<\/span><\/p>\n else:<\/span><\/p>\n \u00a0 \u00a0 <\/span>print(“\u6587\u5b57\u5217\u3067\u306f\u3042\u308a\u307e\u305b\u3093”)<\/span><\/p>\n # \u3082\u3057\u304f\u306f\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3066\u304b\u3089\u7f6e\u63db<\/p>\n value = str(value).replace(“old”, “new”)<\/span><\/p>\n <\/p>\n \u5168\u89d2\u30fb\u534a\u89d2\u3084\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u9055\u3044\u306b\u3088\u308a\u3001\u60f3\u5b9a\u901a\u308a\u306b\u7f6e\u63db\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n <\/p>\n text = “\u3053\u3093\u306b\u3061\u306f\u3000\u4e16\u754c”\u00a0 <\/span># \u5168\u89d2\u30b9\u30da\u30fc\u30b9\u3042\u308a<\/span><\/p>\n print(text.replace(” “, “_”))\u00a0 <\/span># \u534a\u89d2\u30b9\u30da\u30fc\u30b9\u3092\u7f6e\u63db \u2192 \u5168\u89d2\u306f\u7f6e\u63db\u3055\u308c\u306a\u3044<\/span><\/p>\n <\/p>\n \u3053\u306e\u5834\u5408\u3001\u5168\u89d2\u30b9\u30da\u30fc\u30b9\u300c\u3000\u300d\u3068\u534a\u89d2\u30b9\u30da\u30fc\u30b9\u300c \u300d\u3092\u5225\u3005\u306b\u6307\u5b9a\u3059\u308b\u304b\u3001\u4e8b\u524d\u306b\u6587\u5b57\u30b3\u30fc\u30c9\u3092\u7d71\u4e00\u3057\u307e\u3059\u3002<\/p>\n <\/p>\n # \u6587\u5b57\u30b3\u30fc\u30c9\u3092\u7d71\u4e00\u3059\u308b\u4f8b<\/p>\n text = text.encode(“utf-8”).decode(“utf-8”)<\/span><\/p>\nreplace\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c<\/span><\/span><\/h2>\n
![\"\"](\"https:\/\/softasia.jp\/blog\/wp-content\/uploads\/2025\/09\/SOFT-_ASIA-41-300x200.png\")
<\/p>\n\n
\u90e8\u5206\u7684\u306b\u7f6e\u63db\u3059\u308b\u65b9\u6cd5<\/span><\/span><\/h3>\n
\u7f6e\u63db\u524d\u5f8c\u306e\u30c1\u30a7\u30c3\u30af\u65b9\u6cd5<\/span><\/span><\/h3>\n
\u8907\u6570\u306e\u6587\u5b57\u5217\u3092\u307e\u3068\u3081\u3066\u7f6e\u63db\u3059\u308b\u65b9\u6cd5<\/span><\/span><\/h3>\n
<\/h2>\n
\u5b9f\u52d9\u3067\u5f79\u7acb\u3064\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af\u96c6<\/span><\/span><\/h2>\n
![\"\"](\"https:\/\/softasia.jp\/blog\/wp-content\/uploads\/2025\/09\/SOFT-_ASIA-43-300x200.png\")
<\/p>\nreplace\u3068\u6b63\u898f\u8868\u73fere.sub\u306e\u9055\u3044<\/span><\/span><\/h2>\n
![\"\"](\"https:\/\/softasia.jp\/blog\/wp-content\/uploads\/2025\/09\/SOFT-_ASIA-44-300x200.png\")
<\/p>\n\n
\u5b9f\u52d9\u3067\u3042\u308a\u304c\u3061\u306a\u30a8\u30e9\u30fc\u3068\u5bfe\u7b56<\/span><\/span><\/h2>\n
![\"\"](\"https:\/\/softasia.jp\/blog\/wp-content\/uploads\/2025\/09\/SOFT-_ASIA-45-300x200.png\")
<\/p>\n<\/h3>\n
AttributeError \u304c\u51fa\u308b\u5834\u5408\u306e\u5bfe\u51e6\u6cd5<\/b><\/span><\/h3>\n
\u6587\u5b57\u30b3\u30fc\u30c9\u306b\u3088\u308b\u7f6e\u63db\u30df\u30b9\u306e\u56de\u907f<\/b><\/span><\/h3>\n