系统：windows 7
语言版本：Anaconda3-4.3.0.1-Windows-x86_64
编辑器：pycharm-community-2016.3.2
翻翻以前写的文章，发现字符串写过一次了，尴尬
<code class="javascript">X = "Yes;Y = "No"Z = "He is very handsome, {0}, {1}".format(X, Y)print(Z)</code>代码语言：javascript代码运行次数：0运行复制<code class="javascript">X = "Yes";Y= "No"Z = "He is very handsome, {0}, {1}".format(X, Y)print(Z)</code>
{}起到占位作用，{0}的数字与format后面的值对应，从0开始format前的字符串无需和format后的值一一对应，{}中的数值不要超过format后的变量数目-1即可Part 2：{var}代码语言：javascript代码运行次数：0运行复制<code class="javascript">Z = "He is very handsome, {var1}, {var2}".format(var2="Yes", var1="No")print(Z)</code>代码语言：javascript代码运行次数：0运行复制<code class="javascript">Z = "He is very handsome, {var1}, {var2}".format(var2="Yes", var1="No")print(Z)</code>
<code class="javascript">Z = "pi is {:.2f}".format(3.1415926)print(Z)</code>代码语言：javascript代码运行次数：0运行复制<code class="javascript">Z = "pi is {:.2f}".format(3.1415926)print(Z)</code>保留2位小数
不保留小数
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