如何在 Python 中替換包含大括號的字符串？

Question

請參閱下面的代碼以了解我的問題：

str_line = data['line']  # data['line'] holds "I was born in {year}"
str_year = '1987'

預期產出： I was born in 1987

print(str_line)

我嘗試使用以下方法，但輸出始終為原始str_line （即， I was born in {year} ）。

str_line = str_line.replace('{{year}}',str_year)

和

str_line = str_line.replace('/{year/}',str_year)

Answer 1

您可以使用str.format()並將year參數設置為str_year ：

str_line = "I was born in {year}"
str_year = '1987'
print( str_line.format(year=str_year) )
# => I was born in 1987

在線查看 Python 演示

文檔說

海峽 , **  )格式(*  , **  )

執行字符串格式化操作。 調用此方法的字符串可以包含由大括號{}分隔的文字文本或替換字段。 每個替換字段都包含位置參數的數字索引或關鍵字參數的名稱。 返回字符串的副本，其中每個替換字段都替換為相應參數的字符串值。